Adding struct checks to files. This solves countless of issues and bugs.

src/g_ai.c

@@ -72,6 +72,11 @@ This replaces the QC functions: ai_forward, ai_back, ai_pain, and ai_painforward
 */
 void ai_move (edict_t *self, float dist)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	M_walkmove (self, self->s.angles[YAW], dist);
 }
 
@@ -88,6 +93,11 @@ void ai_stand (edict_t *self, float dist)
 {
 	vec3_t	v;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (dist)
 		M_walkmove (self, self->s.angles[YAW], dist);
 
@@ -143,6 +153,11 @@ The monster is walking it's beat
 */
 void ai_walk (edict_t *self, float dist)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	M_MoveToGoal (self, dist);
 
 	// check for noticing a player
@@ -176,6 +191,11 @@ void ai_charge (edict_t *self, float dist)
 {
 	vec3_t	v;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if(self->monsterinfo.aiflags & AI_ONESHOTTARGET)
 	{
 		VectorSubtract (self->monsterinfo.shottarget, self->s.origin, v);
@@ -207,6 +227,11 @@ Distance is for slight position adjustments needed by the animations
 */
 void ai_turn (edict_t *self, float dist)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (dist)
 		M_walkmove (self, self->s.angles[YAW], dist);
 
@@ -259,6 +284,11 @@ int range (edict_t *self, edict_t *other)
 	vec3_t	v;
 	float	len;
 
+ 	if (!self || !other)
+	{
+		return 0;
+	}
+
 	VectorSubtract (self->s.origin, other->s.origin, v);
 	len = VectorLength (v);
 	if (len < MELEE_DISTANCE)
@@ -283,6 +313,11 @@ qboolean visible (edict_t *self, edict_t *other)
 	vec3_t	spot2;
 	trace_t	trace;
 
+	if (!self || !other)
+	{
+		return false;
+	}
+
 	if (self->monsterinfo.flashTime > 0)
 		return false;
 
@@ -311,6 +346,11 @@ qboolean infront (edict_t *self, edict_t *other)
 	float	dot;
 	vec3_t	forward;
 
+	if (!self || !other)
+	{
+		return false;
+	}
+
 	AngleVectors (self->s.angles, forward, NULL, NULL);
 	VectorSubtract (other->s.origin, self->s.origin, vec);
 	VectorNormalize (vec);
@@ -335,6 +375,11 @@ qboolean inweaponLineOfSight (edict_t *self, edict_t *other)
 	float	dot;
 	vec3_t	forward;
 
+	if (!self || !other)
+	{
+		return false;
+	}
+
 	AngleVectors (self->s.angles, forward, NULL, NULL);
 	VectorSubtract (other->s.origin, self->s.origin, vec);
 	VectorNormalize (vec);
@@ -352,6 +397,11 @@ void HuntTarget (edict_t *self)
 {
 	vec3_t	vec;
 
+	if (!self)
+	{
+		return;
+	}
+
 	self->goalentity = self->enemy;
 	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
 		self->monsterinfo.stand (self);
@@ -368,6 +418,11 @@ void FoundTarget (edict_t *self)
 {
 	vec3_t	v;
 
+	if (!self|| !self->enemy || !self->enemy->inuse)
+	{
+		return;
+	}
+
 	// let other monsters see this monster for a while
 	if (self->enemy->client)
 	{
@@ -436,6 +491,11 @@ qboolean FindTarget (edict_t *self)
 	qboolean	heardit;
 	int			r;
 
+	if (!self)
+	{
+		return false;
+	}
+
 	if (self->monsterinfo.aiflags & AI_GOOD_GUY)
 	{
 		if (self->goalentity && self->goalentity->inuse && self->goalentity->classname)
@@ -619,6 +679,11 @@ qboolean FacingIdeal(edict_t *self)
 {
 	float	delta;
 
+	if (!self)
+	{
+		return false;
+	}
+
 	delta = anglemod(self->s.angles[YAW] - self->ideal_yaw);
 	if (delta > 45 && delta < 315)
 		return false;
@@ -634,6 +699,11 @@ qboolean M_CheckAttack (edict_t *self)
 	float	chance;
 	trace_t	tr;
 
+	if (!self || !self->enemy || !self->enemy->inuse)
+	{
+		return false;
+	}
+
 	if (self->enemy->health > 0)
 	{
 	// see if any entities are in the way of the shot
@@ -726,6 +796,11 @@ Turn and close until within an angle to launch a melee attack
 */
 void ai_run_melee(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->ideal_yaw = enemy_yaw;
 	M_ChangeYaw (self);
 
@@ -746,6 +821,11 @@ Turn in place until within an angle to launch a missile attack
 */
 void ai_run_missile(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->ideal_yaw = enemy_yaw;
 	M_ChangeYaw (self);
 
@@ -768,6 +848,11 @@ void ai_run_slide(edict_t *self, float distance)
 {
 	float	ofs;
 
+	if (!self)
+	{
+		return;
+	}
+
 	self->ideal_yaw = enemy_yaw;
 	M_ChangeYaw (self);
 
@@ -793,6 +878,11 @@ void ai_fly_strafe(edict_t *self, float dist)
 {
 	vec3_t forward, right, vel;
 
+	if (!self)
+	{
+		return;
+	}
+
 	// face the enemy
 	self->ideal_yaw = enemy_yaw;
 	M_ChangeYaw (self);
@@ -822,6 +912,13 @@ qboolean ai_checkattack (edict_t *self, float dist)
 	vec3_t		temp;
 	qboolean	hesDeadJim;
 
+	if (!self)
+	{
+		enemy_vis = false;
+
+		return false;
+	}
+
 	// this causes monsters to run blindly to the combat point w/o firing
 	if (self->goalentity)
 	{
@@ -965,6 +1062,11 @@ void ai_run (edict_t *self, float dist)
 	float		left, center, right;
 	vec3_t		left_target, right_target;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.flashTime > 0)
 	{
 		M_MoveAwayFromFlare(self, dist);

src/g_cmds.c

@@ -6,6 +6,11 @@ ClientTeam (edict_t *ent, char* value)
 {
 	char		*p;
 
+	if (!ent)
+	{
+		return value;
+	}
+
 	value[0] = 0;
 
 	if (!ent->client)
@@ -30,6 +35,11 @@ qboolean OnSameTeam (edict_t *ent1, edict_t *ent2)
 	char	ent1Team [512];
 	char	ent2Team [512];
 
+	if (!ent1 || !ent2)
+	{
+		return false;
+	}
+
 	if (!((int)(dmflags->value) & (DF_MODELTEAMS | DF_SKINTEAMS)))
 		return false;
 
@@ -49,6 +59,11 @@ void SelectNextItem (edict_t *ent, int itflags)
 	int			i, index;
 	gitem_t		*it;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	cl = ent->client;
 
 	// scan  for the next valid one
@@ -78,6 +93,11 @@ void SelectPrevItem (edict_t *ent, int itflags)
 	int			i, index;
 	gitem_t		*it;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	cl = ent->client;
 
 	// scan  for the next valid one
@@ -105,6 +125,11 @@ void ValidateSelectedItem (edict_t *ent)
 {
 	gclient_t	*cl;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	cl = ent->client;
 
 	if (cl->pers.inventory[cl->pers.selected_item])
@@ -134,6 +159,11 @@ void Cmd_Give_f (edict_t *ent)
 	int     numargs;
 	char tryname[256];
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (deathmatch->value && !sv_cheats->value)
 	{
 		gi.cprintf (ent, PRINT_HIGH, "You must run the server with '+set cheats 1' to enable this command.\n");
@@ -314,6 +344,11 @@ void Cmd_God_f (edict_t *ent)
 {
 	char	*msg;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if ((deathmatch->value || coop->value) && !sv_cheats->value)
 	{
 		gi.cprintf (ent, PRINT_HIGH, "You must run the server with '+set cheats 1' to enable this command.\n");
@@ -343,6 +378,11 @@ void Cmd_Notarget_f (edict_t *ent)
 {
 	char	*msg;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if ((deathmatch->value || coop->value) && !sv_cheats->value)
 	{
 		gi.cprintf (ent, PRINT_HIGH, "You must run the server with '+set cheats 1' to enable this command.\n");
@@ -370,6 +410,11 @@ void Cmd_Noclip_f (edict_t *ent)
 {
 	char	*msg;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if ((deathmatch->value || coop->value) && !sv_cheats->value)
 	{
 		gi.cprintf (ent, PRINT_HIGH, "You must run the server with '+set cheats 1' to enable this command.\n");
@@ -414,6 +459,12 @@ qboolean tryUse(edict_t *ent, char *s)
 {
 	int index = 0;
 	gitem_t *it = FindItem(s);
+
+	if (!ent)
+	{
+		return false;
+	}
+
 	if (!it)
 	{
 		gi.cprintf (ent, PRINT_HIGH, "unknown item: %s\n", s);
@@ -438,6 +489,11 @@ void findNext(edict_t *ent, struct altsel_s *ptr, int offset)
 {
 	int start = offset;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	while (1)
 	{
 		if (tryUse(ent, ptr->weapon[offset]))
@@ -460,6 +516,11 @@ void altSelect(edict_t *ent, int num)
 	struct altsel_s *ptr = NULL;
 	gitem_t *it = NULL;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	// within range?
 	if (num < 1 || num > 10)
 	{
@@ -504,6 +565,11 @@ void Cmd_Use_f (edict_t *ent)
 	gitem_t		*it;
 	char		*s;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	// are we using a multiselect item?
 	if (Q_stricmp(gi.argv(1), "weapon") == 0)
 	{
@@ -551,6 +617,11 @@ void Cmd_Drop_f (edict_t *ent)
 	gitem_t		*it;
 	char		*s;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	s = gi.args();
 	it = FindItem (s);
 	if (!it)
@@ -584,6 +655,11 @@ void Cmd_Inven_f (edict_t *ent)
 	int			i;
 	gclient_t	*cl;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	cl = ent->client;
 
 	cl->showscores = false;
@@ -621,6 +697,11 @@ void Cmd_InvUse_f (edict_t *ent)
 {
 	gitem_t		*it;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	ValidateSelectedItem (ent);
 
 	if (ent->client->pers.selected_item == -1)
@@ -650,6 +731,11 @@ void Cmd_WeapPrev_f (edict_t *ent)
 	gitem_t		*it;
 	int			selected_weapon;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	cl = ent->client;
 
 	if (!cl->pers.weapon)
@@ -688,6 +774,11 @@ void Cmd_WeapNext_f (edict_t *ent)
 	gitem_t		*it;
 	int			selected_weapon;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	cl = ent->client;
 
 	if (!cl->pers.weapon)
@@ -725,6 +816,11 @@ void Cmd_WeapLast_f (edict_t *ent)
 	int			index;
 	gitem_t		*it;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	cl = ent->client;
 
 	if (!cl->pers.weapon || !cl->pers.lastweapon)
@@ -750,6 +846,11 @@ void Cmd_InvDrop_f (edict_t *ent)
 {
 	gitem_t		*it;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	ValidateSelectedItem (ent);
 
 	if (ent->client->pers.selected_item == -1)
@@ -774,6 +875,11 @@ Cmd_Kill_f
 */
 void Cmd_Kill_f (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if((level.time - ent->client->respawn_time) < 5)
 		return;
 	ent->flags &= ~FL_GODMODE;
@@ -793,6 +899,11 @@ Cmd_PutAway_f
 */
 void Cmd_PutAway_f (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->client->showscores = false;
 	ent->client->showhelp = false;
 	ent->client->showinventory = false;
@@ -832,6 +943,11 @@ void Cmd_Players_f (edict_t *ent)
 	char	large[1280];
 	int		index[256];
 
+	if (!ent)
+	{
+		return;
+	}
+
 	count = 0;
 	for (i = 0 ; i < maxclients->value ; i++)
 		if (game.clients[i].pers.connected)
@@ -871,6 +987,11 @@ void Cmd_Wave_f (edict_t *ent)
 {
 	int		i;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	i = atoi (gi.argv(1));
 
 	// can't wave when ducked
@@ -925,6 +1046,11 @@ void Cmd_Say_f (edict_t *ent, qboolean team, qboolean arg0)
 	char	*p;
 	char	text[2048];
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (gi.argc () < 2 && !arg0)
 		return;
 
@@ -988,6 +1114,11 @@ void ClientCommand (edict_t *ent)
 {
 	char	*cmd;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (!ent->client)
 		return;		// not fully in game yet
 

src/g_combat.c

@@ -15,6 +15,11 @@ qboolean CanDamage (edict_t *targ, edict_t *inflictor)
 	vec3_t	dest;
 	trace_t	trace;
 
+	if (!targ || !inflictor)
+	{
+		return false;
+	}
+
 	// bmodels need special checking because their origin is 0,0,0
 	if (targ->movetype == MOVETYPE_PUSH)
 	{
@@ -72,6 +77,11 @@ Killed
 */
 void Killed (edict_t *targ, edict_t *inflictor, edict_t *attacker, int damage, vec3_t point)
 {
+	if (!targ || !inflictor || !attacker)
+	{
+		return;
+	}
+
 	if (targ->health < -999)
 		targ->health = -999;
 
@@ -159,6 +169,11 @@ int CheckPowerArmor (edict_t *ent, vec3_t point, vec3_t normal, int damage, int
 	int			power;
 	int			power_used;
 
+	if (!ent)
+	{
+		return 0;
+	}
+
 	if (!damage)
 		return 0;
 
@@ -264,6 +279,11 @@ int CheckArmor (edict_t *ent, vec3_t point, vec3_t normal, int damage, int te_sp
 	int			index;
 	gitem_t		*armor;
 
+	if (!ent)
+	{
+		return 0;
+	}
+
 	if (!damage)
 		return 0;
 
@@ -305,6 +325,11 @@ int CheckArmor (edict_t *ent, vec3_t point, vec3_t normal, int damage, int te_sp
 
 void M_ReactToDamage (edict_t *targ, edict_t *attacker)
 {
+	if (!targ || !attacker)
+	{
+		return;
+	}
+
 	if (!(attacker->client) && !(attacker->svflags & SVF_MONSTER) &&
 		(strcmp (attacker->classname, "monster_autocannon") != 0))
 		return;
@@ -385,6 +410,11 @@ void T_Damage (edict_t *targ, edict_t *inflictor, edict_t *attacker, vec3_t dir,
 	int			psave;
 	int			te_sparks;
 
+	if (!targ || !inflictor || !attacker)
+	{
+		return;
+	}
+
 	if (!targ->takedamage)
 		return;
 
@@ -582,6 +612,12 @@ void T_RadiusDamage (edict_t *inflictor, edict_t *attacker, float damage, edict_
 	vec3_t	v;
 	vec3_t	dir;
 
+
+	if (!inflictor || !attacker || !ignore)
+	{
+		return;
+	}
+
 	while ((ent = findradius(ent, inflictor->s.origin, radius)) != NULL)
 	{
 		if (ent == ignore)
@@ -619,6 +655,12 @@ void T_RadiusDamagePosition (vec3_t origin, edict_t *inflictor, edict_t *attacke
 	vec3_t	v;
 	vec3_t	dir;
 
+
+	if (!inflictor || !ignore)
+	{
+		return;
+	}
+
 	while ((ent = findradius(ent, origin, radius)) != NULL)
 	{
 		if (ent == ignore)

src/g_func.c

@@ -64,6 +64,12 @@
 
 void Move_Done (edict_t *ent)
 {
+
+	if (!ent)
+	{
+		return;
+	}
+
 	VectorClear (ent->velocity);
 	VectorClear(ent->avelocity);
 	ent->moveinfo.endfunc (ent);
@@ -71,6 +77,11 @@ void Move_Done (edict_t *ent)
 
 void Move_Final (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->moveinfo.remaining_distance == 0)
 	{
 		Move_Done (ent);
@@ -87,6 +98,11 @@ void Move_Begin (edict_t *ent)
 {
 	float	frames;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if ((ent->moveinfo.speed * FRAMETIME) >= ent->moveinfo.remaining_distance)
 	{
 		Move_Final (ent);
@@ -107,6 +123,11 @@ void Think_SmoothAccelMove (edict_t *ent);
 
 void Move_Calc (edict_t *ent, vec3_t dest, void(*func)(edict_t*), int smoothSpeedChange)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	VectorClear (ent->velocity);
 	VectorSubtract (dest, ent->s.origin, ent->moveinfo.dir);
 	ent->moveinfo.remaining_distance = VectorNormalize (ent->moveinfo.dir);
@@ -177,6 +198,11 @@ void Move_Calc (edict_t *ent, vec3_t dest, void(*func)(edict_t*), int smoothSpee
 
 void AngleMove_Done (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	VectorClear (ent->avelocity);
 	ent->moveinfo.endfunc (ent);
 }
@@ -185,6 +211,11 @@ void AngleMove_Final (edict_t *ent)
 {
 	vec3_t	move;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->moveinfo.state == STATE_UP)
 		VectorSubtract (ent->moveinfo.end_angles, ent->s.angles, move);
 	else
@@ -209,6 +240,11 @@ void AngleMove_Begin (edict_t *ent)
 	float	traveltime;
 	float	frames;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	// set destdelta to the vector needed to move
 	if (ent->moveinfo.state == STATE_UP)
 		VectorSubtract (ent->moveinfo.end_angles, ent->s.angles, destdelta);
@@ -239,6 +275,12 @@ void AngleMove_Begin (edict_t *ent)
 
 void AngleMove_Calc (edict_t *ent, void(*func)(edict_t*))
 {
+
+	if (!ent)
+	{
+		return;
+	}
+
 	VectorClear (ent->avelocity);
 	ent->moveinfo.endfunc = func;
 	if (level.current_entity == ((ent->flags & FL_TEAMSLAVE) ? ent->teammaster : ent))
@@ -268,6 +310,11 @@ void plat_CalcAcceleratedMove(moveinfo_t *moveinfo)
 	float	accel_dist;
 	float	decel_dist;
 
+	if (!moveinfo)
+	{
+		return;
+	}
+
 	moveinfo->move_speed = moveinfo->speed;
 
 	if (moveinfo->remaining_distance < moveinfo->accel)
@@ -293,6 +340,11 @@ void plat_CalcAcceleratedMove(moveinfo_t *moveinfo)
 
 void plat_Accelerate (moveinfo_t *moveinfo)
 {
+	if (!moveinfo)
+	{
+		return;
+	}
+
 	// are we decelerating?
 	if (moveinfo->remaining_distance <= moveinfo->decel_distance)
 	{
@@ -364,6 +416,11 @@ void plat_Accelerate (moveinfo_t *moveinfo)
 
 void Think_AccelMove (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->moveinfo.remaining_distance -= ent->moveinfo.current_speed;
 
 	if (ent->moveinfo.current_speed == 0)		// starting or blocked
@@ -397,6 +454,11 @@ change the speed for the next frame
 
 void Think_SmoothAccelMove (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->moveinfo.remaining_distance >= ent->moveinfo.current_speed)
 	{
 		ent->moveinfo.remaining_distance -= ent->moveinfo.current_speed;
@@ -432,6 +494,11 @@ void plat_go_down (edict_t *ent);
 
 void plat_hit_top (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if (!(ent->flags & FL_TEAMSLAVE))
 	{
 		if (ent->moveinfo.sound_end)
@@ -446,6 +513,11 @@ void plat_hit_top (edict_t *ent)
 
 void plat_hit_bottom (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if (!(ent->flags & FL_TEAMSLAVE))
 	{
 		if (ent->moveinfo.sound_end)
@@ -457,6 +529,11 @@ void plat_hit_bottom (edict_t *ent)
 
 void plat_go_down (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if (!(ent->flags & FL_TEAMSLAVE))
 	{
 		if (ent->moveinfo.sound_start)
@@ -469,6 +546,11 @@ void plat_go_down (edict_t *ent)
 
 void plat_go_up (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if (!(ent->flags & FL_TEAMSLAVE))
 	{
 		if (ent->moveinfo.sound_start)
@@ -481,6 +563,11 @@ void plat_go_up (edict_t *ent)
 
 void plat_blocked (edict_t *self, edict_t *other)
 {
+	if (!self || !other)
+	{
+		return;
+	}
+
 	if (!(other->svflags & SVF_MONSTER) && (!other->client) )
 	{
 		// give it a chance to go away on it's own terms (like gibs)
@@ -508,16 +595,26 @@ void plat_blocked (edict_t *self, edict_t *other)
 }
 
 
-void Use_Plat (edict_t *ent, edict_t *other, edict_t *activator)
+void Use_Plat (edict_t *ent, edict_t *other /* unused */, edict_t *activator /* unused */)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->think)
 		return;		// already down
 	plat_go_down (ent);
 }
 
 
-void Touch_Plat_Center (edict_t *ent, edict_t *other, cplane_t *plane, csurface_t *surf)
+void Touch_Plat_Center (edict_t *ent, edict_t *other, cplane_t *plane /* unused */, csurface_t *surf /* unused */)
 {
+	if (!ent || !other)
+	{
+		return;
+	}
+
 	if (!other->client)
 		return;
 		
@@ -544,6 +641,11 @@ void plat_spawn_inside_trigger (edict_t *ent)
 	edict_t	*trigger;
 	vec3_t	tmin, tmax;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	//
 	// middle trigger
 	//	
@@ -603,6 +705,11 @@ Set "sounds" to one of the following:
 */
 void SP_func_plat (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	VectorClear (ent->s.angles);
 	ent->solid = SOLID_BSP;
 	ent->movetype = MOVETYPE_PUSH;
@@ -687,17 +794,32 @@ STOP mean it will stop moving instead of pushing entities
 
 void rotating_blocked (edict_t *self, edict_t *other)
 {
+	if (!self || !other)
+	{
+		return;
+	}
+
 	T_Damage (other, self, self, vec3_origin, other->s.origin, vec3_origin, self->dmg, 1, 0, MOD_CRUSH);
 }
 
 void rotating_touch (edict_t *self, edict_t *other, cplane_t *plane, csurface_t *surf)
 {
+	if (!self || !other)
+	{
+		return;
+	}
+
 	if (self->moveinfo.state != STATE_STOPPED)
 		T_Damage (other, self, self, vec3_origin, other->s.origin, vec3_origin, self->dmg, 1, 0, MOD_CRUSH);
 }
 
 void rotating_think(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->nextthink = level.time + FRAMETIME;
 	if (self->moveinfo.state == STATE_DECEL)
 	{
@@ -730,8 +852,13 @@ void rotating_think(edict_t *self)
 	VectorScale(self->movedir, self->moveinfo.current_speed, self->avelocity);
 }
 
-void rotating_use (edict_t *self, edict_t *other, edict_t *activator)
+void rotating_use (edict_t *self, edict_t *other /* unused */, edict_t *activator /* unused */)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	// if we're at full speed or we're accelerating
 	if (self->moveinfo.state == STATE_TOPSPEED || self->moveinfo.state == STATE_ACCEL) 
 	{
@@ -773,6 +900,11 @@ void rotating_use (edict_t *self, edict_t *other, edict_t *activator)
 
 void SP_func_rotating (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->solid = SOLID_BSP;
 	if (ent->spawnflags & 32)
 		ent->movetype = MOVETYPE_STOP;
@@ -843,6 +975,11 @@ When a button is touched, it moves some distance in the direction of it's angle,
 
 void button_done (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->moveinfo.state = STATE_BOTTOM;
 	self->s.effects &= ~EF_ANIM23;
 	self->s.effects |= EF_ANIM01;
@@ -850,6 +987,11 @@ void button_done (edict_t *self)
 
 void button_return (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->moveinfo.state = STATE_DOWN;
 
 	Move_Calc (self, self->moveinfo.start_origin, button_done, false);
@@ -862,6 +1004,11 @@ void button_return (edict_t *self)
 
 void button_wait (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->moveinfo.state = STATE_TOP;
 	self->s.effects &= ~EF_ANIM01;
 	self->s.effects |= EF_ANIM23;
@@ -877,6 +1024,11 @@ void button_wait (edict_t *self)
 
 void button_fire (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->moveinfo.state == STATE_UP || self->moveinfo.state == STATE_TOP)
 		return;
 
@@ -888,12 +1040,22 @@ void button_fire (edict_t *self)
 
 void button_use (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self || !activator)
+	{
+		return;
+	}
+
 	self->activator = activator;
 	button_fire (self);
 }
 
 void button_touch (edict_t *self, edict_t *other, cplane_t *plane, csurface_t *surf)
 {
+	if (!self || !other)
+	{
+		return;
+	}
+
 	if (!other->client)
 		return;
 
@@ -906,6 +1068,11 @@ void button_touch (edict_t *self, edict_t *other, cplane_t *plane, csurface_t *s
 
 void button_killed (edict_t *self, edict_t *inflictor, edict_t *attacker, int damage, vec3_t point)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->activator = attacker;
 	self->health = self->max_health;
 	self->takedamage = DAMAGE_NO;
@@ -917,6 +1084,11 @@ void SP_func_button (edict_t *ent)
 	vec3_t	abs_movedir;
 	float	dist;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	G_SetMovedir (ent->s.angles, ent->movedir);
 	ent->movetype = MOVETYPE_STOP;
 	ent->solid = SOLID_BSP;
@@ -1005,6 +1177,11 @@ void door_use_areaportals (edict_t *self, qboolean open)
 {
 	edict_t	*t = NULL;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (!self->target)
 		return;
 
@@ -1021,6 +1198,11 @@ void door_go_down (edict_t *self);
 
 void door_hit_top (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!(self->flags & FL_TEAMSLAVE))
 	{
 		if (self->moveinfo.sound_end)
@@ -1039,6 +1221,11 @@ void door_hit_top (edict_t *self)
 
 void door_hit_bottom (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!(self->flags & FL_TEAMSLAVE))
 	{
 		if (self->moveinfo.sound_end)
@@ -1051,6 +1238,11 @@ void door_hit_bottom (edict_t *self)
 
 void door_go_down (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!(self->flags & FL_TEAMSLAVE))
 	{
 		if (self->moveinfo.sound_start)
@@ -1072,6 +1264,11 @@ void door_go_down (edict_t *self)
 
 void door_go_up (edict_t *self, edict_t *activator)
 {
+	if (!self || !activator)
+	{
+		return;
+	}
+
 	if (self->moveinfo.state == STATE_UP)
 		return;		// already going up
 
@@ -1102,6 +1299,11 @@ void door_openclose (edict_t *self, edict_t *other, edict_t *activator)
 {
 	edict_t	*ent;
 
+	if (!self || !activator)
+	{
+		return;
+	}
+
 	if (self->flags & FL_TEAMSLAVE)
 		return;
 
@@ -1138,6 +1340,12 @@ void door_use (edict_t *self, edict_t *other, edict_t *activator)
 {
 	// toggle active?
 	edict_t *ent;
+
+	if (!self || !other || !activator)
+	{
+		return;
+	}
+
 	if (self->active & DOOR_ACTIVE_TOGGLE)
 	{
 		for (ent = self ; ent ; ent = ent->teamchain)
@@ -1160,6 +1368,11 @@ void door_use (edict_t *self, edict_t *other, edict_t *activator)
 
 void Touch_DoorTrigger (edict_t *self, edict_t *other, cplane_t *plane, csurface_t *surf)
 {
+	if (!self || !other)
+	{
+		return;
+	}
+
 	if (other->health <= 0)
 		return;
 
@@ -1190,6 +1403,11 @@ void Think_CalcMoveSpeed (edict_t *self)
 	float	ratio;
 	float	dist;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->flags & FL_TEAMSLAVE)
 		return;		// only the team master does this
 
@@ -1226,6 +1444,11 @@ void Think_SpawnDoorTrigger (edict_t *ent)
 	edict_t		*other;
 	vec3_t		mins, maxs;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->flags & FL_TEAMSLAVE)
 		return;		// only the team leader spawns a trigger
 
@@ -1264,6 +1487,11 @@ void door_blocked  (edict_t *self, edict_t *other)
 {
 	edict_t	*ent;
 
+	if (!self || !other)
+	{
+		return;
+	}
+
 	if (!(other->svflags & SVF_MONSTER) && (!other->client) )
 	{
 		// give it a chance to go away on it's own terms (like gibs)
@@ -1310,6 +1538,11 @@ void door_killed (edict_t *self, edict_t *inflictor, edict_t *attacker, int dama
 {
 	edict_t	*ent;
 
+	if (!self || !attacker)
+	{
+		return;
+	}
+
 	for (ent = self->teammaster ; ent ; ent = ent->teamchain)
 	{
 		ent->health = ent->max_health;
@@ -1320,6 +1553,11 @@ void door_killed (edict_t *self, edict_t *inflictor, edict_t *attacker, int dama
 
 void door_touch (edict_t *self, edict_t *other, cplane_t *plane, csurface_t *surf)
 {
+	if (!self || !other)
+	{
+		return;
+	}
+
 	if (!other->client)
 		return;
 
@@ -1338,6 +1576,11 @@ void SP_func_door (edict_t *ent)
 {
 	vec3_t	abs_movedir;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->sounds != 1)
 	{
 		ent->moveinfo.sound_start = gi.soundindex  ("doors/dr1_strt.wav");
@@ -1463,6 +1706,11 @@ REVERSE will cause the door to rotate in the opposite direction.
 
 void SP_func_door_rotating (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	VectorClear (ent->s.angles);
 
 	// set the axis of rotation
@@ -1580,6 +1828,11 @@ void SP_func_water (edict_t *self)
 {
 	vec3_t	abs_movedir;
 
+	if (!self)
+	{
+		return;
+	}
+
 	G_SetMovedir (self->s.angles, self->movedir);
 	self->movetype = MOVETYPE_PUSH;
 	self->solid = SOLID_BSP;
@@ -1665,6 +1918,11 @@ void train_next (edict_t *self);
 
 void train_blocked (edict_t *self, edict_t *other)
 {
+	if (!self || !other)
+	{
+		return;
+	}
+
 	if (!(other->svflags & SVF_MONSTER) && (!other->client) )
 	{
 		// give it a chance to go away on it's own terms (like gibs)
@@ -1694,6 +1952,11 @@ void train_blocked (edict_t *self, edict_t *other)
 
 void train_wait (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->target_ent->pathtarget)
 	{
 		char	*savetarget;
@@ -1745,6 +2008,11 @@ void train_next (edict_t *self)
 	vec3_t		dest;
 	qboolean	first;
 
+	if (!self)
+	{
+		return;
+	}
+
 	first = true;
 again:
 	if (!self->target)
@@ -1825,6 +2093,11 @@ void train_resume (edict_t *self)
 	edict_t	*ent;
 	vec3_t	dest;
 
+	if (!self)
+	{
+		return;
+	}
+
 	ent = self->target_ent;
 
 	VectorSubtract (ent->s.origin, self->mins, dest);
@@ -1839,6 +2112,11 @@ void func_train_find (edict_t *self)
 {
 	edict_t *ent;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (!self->target)
 	{
 		gi.dprintf ("train_find: no target\n");
@@ -1869,6 +2147,11 @@ void func_train_find (edict_t *self)
 
 void train_use (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self || !activator)
+	{
+		return;
+	}
+
 	self->activator = activator;
 
 	if (self->spawnflags & TRAIN_START_ON)
@@ -1890,6 +2173,11 @@ void train_use (edict_t *self, edict_t *other, edict_t *activator)
 
 void SP_func_train (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->movetype = MOVETYPE_PUSH;
 
 	VectorClear (self->s.angles);
@@ -1950,6 +2238,11 @@ void trigger_elevator_use (edict_t *self, edict_t *other, edict_t *activator)
 {
 	edict_t *target;
 
+	if (!self || !other)
+	{
+		return;
+	}
+
 	if (self->movetarget->nextthink)
 	{
 //		gi.dprintf("elevator busy\n");
@@ -1975,6 +2268,11 @@ void trigger_elevator_use (edict_t *self, edict_t *other, edict_t *activator)
 
 void trigger_elevator_init (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!self->target)
 	{
 		gi.dprintf("trigger_elevator has no target\n");
@@ -1999,6 +2297,11 @@ void trigger_elevator_init (edict_t *self)
 
 void SP_trigger_elevator (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->think = trigger_elevator_init;
 	self->nextthink = level.time + FRAMETIME;
 }
@@ -2022,6 +2325,11 @@ void parseTargets(edict_t *self)
 {
 	int numTargets = 0;
 
+	if (!self)
+	{
+		return;
+	}
+
 	self->numTargets = 0;
 	if (self->target)
 	{
@@ -2059,6 +2367,11 @@ void parseTargets(edict_t *self)
 
 void func_timer_think (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->numTargets <= 0)
 		return;
 
@@ -2071,6 +2384,11 @@ void func_timer_think (edict_t *self)
 
 void func_timer_use (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self || !activator)
+	{
+		return;
+	}
+
 	self->activator = activator;
 
 	// if on, turn it off
@@ -2089,6 +2407,11 @@ void func_timer_use (edict_t *self, edict_t *other, edict_t *activator)
 
 void SP_func_timer (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!self->wait)
 		self->wait = 1.0;
 
@@ -2121,6 +2444,11 @@ speed	default 100
 
 void func_conveyor_use (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->spawnflags & 1)
 	{
 		self->speed = 0;
@@ -2138,6 +2466,11 @@ void func_conveyor_use (edict_t *self, edict_t *other, edict_t *activator)
 
 void SP_func_conveyor (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!self->speed)
 		self->speed = 100;
 
@@ -2182,6 +2515,11 @@ void door_secret_done (edict_t *self);
 
 void door_secret_use (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	// make sure we're not already moving
 	if (!VectorCompare(self->s.origin, vec3_origin))
 		return;
@@ -2192,17 +2530,32 @@ void door_secret_use (edict_t *self, edict_t *other, edict_t *activator)
 
 void door_secret_move1 (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->nextthink = level.time + 1.0;
 	self->think = door_secret_move2;
 }
 
 void door_secret_move2 (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	Move_Calc (self, self->pos2, door_secret_move3, false);
 }
 
 void door_secret_move3 (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->wait == -1)
 		return;
 	self->nextthink = level.time + self->wait;
@@ -2211,22 +2564,42 @@ void door_secret_move3 (edict_t *self)
 
 void door_secret_move4 (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	Move_Calc (self, self->pos1, door_secret_move5, false);
 }
 
 void door_secret_move5 (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->nextthink = level.time + 1.0;
 	self->think = door_secret_move6;
 }
 
 void door_secret_move6 (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	Move_Calc (self, vec3_origin, door_secret_done, false);
 }
 
 void door_secret_done (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!(self->targetname) || (self->spawnflags & SECRET_ALWAYS_SHOOT))
 	{
 		self->health = 0;
@@ -2237,6 +2610,11 @@ void door_secret_done (edict_t *self)
 
 void door_secret_blocked  (edict_t *self, edict_t *other)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!(other->svflags & SVF_MONSTER) && (!other->client) )
 	{
 		// give it a chance to go away on it's own terms (like gibs)
@@ -2264,6 +2642,11 @@ void door_secret_blocked  (edict_t *self, edict_t *other)
 
 void door_secret_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damage, vec3_t point)
 {
+	if (!self || !attacker)
+	{
+		return;
+	}
+
 	self->takedamage = DAMAGE_NO;
 	door_secret_use (self, attacker, attacker);
 }
@@ -2275,6 +2658,11 @@ void SP_func_door_secret (edict_t *ent)
 	float	width;
 	float	length;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->moveinfo.sound_start = gi.soundindex  ("doors/dr1_strt.wav");
 	ent->moveinfo.sound_middle = gi.soundindex  ("doors/dr1_mid.wav");
 	ent->moveinfo.sound_end = gi.soundindex  ("doors/dr1_end.wav");
@@ -2341,6 +2729,11 @@ Kills everything inside when fired, irrespective of protection.
 */
 void use_killbox (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	KillBox (self);
 
 	/* Hack to make sure that really everything is killed */
@@ -2355,6 +2748,11 @@ void use_killbox (edict_t *self, edict_t *other, edict_t *activator)
 
 void SP_func_killbox (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	gi.setmodel (ent, ent->model);
 	ent->use = use_killbox;
 	ent->svflags = SVF_NOCLIENT;

src/g_items.c

@@ -127,6 +127,11 @@ void precacheAllItems()
 
 void DoRespawn (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->team)
 	{
 		edict_t	*master;
@@ -154,6 +159,11 @@ void DoRespawn (edict_t *ent)
 
 void SetRespawn (edict_t *ent, float delay)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->flags |= FL_RESPAWN;
 	ent->svflags |= SVF_NOCLIENT;
 	ent->solid = SOLID_NOT;
@@ -169,6 +179,11 @@ qboolean Pickup_Powerup (edict_t *ent, edict_t *other)
 {
 	int		quantity;
 
+	if (!ent || !other)
+	{
+		return false;
+	}
+
 	quantity = other->client->pers.inventory[ITEM_INDEX(ent->item)];
 	if ((skill->value == SKILL_MEDIUM && quantity >= 2) || (skill->value >= SKILL_HARD && quantity >= 1))
 		return false;
@@ -205,6 +220,11 @@ void Drop_General (edict_t *ent, gitem_t *item)
 
 qboolean Pickup_Adrenaline (edict_t *ent, edict_t *other)
 {
+	if (!ent || !other)
+	{
+		return false;
+	}
+
 	if (!deathmatch->value)
 		other->max_health += 1;
 
@@ -219,6 +239,11 @@ qboolean Pickup_Adrenaline (edict_t *ent, edict_t *other)
 
 qboolean Pickup_AncientHead (edict_t *ent, edict_t *other)
 {
+	if (!ent || !other)
+	{
+		return false;
+	}
+
 	other->max_health += 2;
 
 	if (!(ent->spawnflags & DROPPED_ITEM) && (deathmatch->value))
@@ -232,6 +257,11 @@ qboolean Pickup_Bandolier (edict_t *ent, edict_t *other)
 	gitem_t	*item;
 	int		index;
 
+	if (!ent || !other)
+	{
+		return false;
+	}
+
 	if (other->client->pers.max_bullets < 250)
 		other->client->pers.max_bullets = 250;
 	if (other->client->pers.max_shells < 150)
@@ -270,6 +300,11 @@ qboolean Pickup_Pack (edict_t *ent, edict_t *other)
 	gitem_t	*item;
 	int		index;
 
+	if (!ent || !other)
+	{
+		return false;
+	}
+
 	if (other->client->pers.max_bullets < 300)
 		other->client->pers.max_bullets = 300;
 	if (other->client->pers.max_shells < 200)
@@ -393,6 +428,11 @@ void Use_Quad (edict_t *ent, gitem_t *item)
 {
 	int		timeout;
 
+	if (!ent || !item)
+	{
+		return;
+	}
+
 	ent->client->pers.inventory[ITEM_INDEX(item)]--;
 	ValidateSelectedItem (ent);
 
@@ -418,6 +458,11 @@ void Use_Quad (edict_t *ent, gitem_t *item)
 
 void Use_Breather (edict_t *ent, gitem_t *item)
 {
+	if (!ent || !item)
+	{
+		return;
+	}
+
 	ent->client->pers.inventory[ITEM_INDEX(item)]--;
 	ValidateSelectedItem (ent);
 
@@ -431,6 +476,11 @@ void Use_Breather (edict_t *ent, gitem_t *item)
 
 void Use_Envirosuit (edict_t *ent, gitem_t *item)
 {
+	if (!ent || !item)
+	{
+		return;
+	}
+
 	ent->client->pers.inventory[ITEM_INDEX(item)]--;
 	ValidateSelectedItem (ent);
 
@@ -444,6 +494,11 @@ void Use_Envirosuit (edict_t *ent, gitem_t *item)
 
 void	Use_Invulnerability (edict_t *ent, gitem_t *item)
 {
+	if (!ent || !item)
+	{
+		return;
+	}
+
 	ent->client->pers.inventory[ITEM_INDEX(item)]--;
 	ValidateSelectedItem (ent);
 
@@ -459,6 +514,11 @@ void	Use_Invulnerability (edict_t *ent, gitem_t *item)
 
 void	Use_Silencer (edict_t *ent, gitem_t *item)
 {
+	if (!ent || !item)
+	{
+		return;
+	}
+
 	ent->client->pers.inventory[ITEM_INDEX(item)]--;
 	ValidateSelectedItem (ent);
 	ent->client->silencer_shots += 30;
@@ -468,6 +528,11 @@ void	Use_Silencer (edict_t *ent, gitem_t *item)
 
 qboolean Pickup_Key (edict_t *ent, edict_t *other)
 {
+	if (!ent || !other)
+	{
+		return false;
+	}
+
 	if (coop->value)
 	{
 		if (strcmp(ent->classname, "key_power_cube") == 0)
@@ -496,6 +561,11 @@ qboolean Add_Ammo (edict_t *ent, gitem_t *item, int count)
 	int			index;
 	int			max;
 
+	if (!ent || !item)
+	{
+		return false;
+	}
+
 	if (!ent->client)
 		return false;
 
@@ -543,6 +613,11 @@ qboolean Pickup_Ammo (edict_t *ent, edict_t *other)
 	int			count;
 	qboolean	weapon;
 
+	if (!ent || !other)
+	{
+		return false;
+	}
+
 	weapon = (ent->item->flags & IT_WEAPON);
 	if ( (weapon) && ( (int)dmflags->value & DF_INFINITE_AMMO ) )
 		count = 1000;
@@ -589,6 +664,11 @@ void Drop_Ammo (edict_t *ent, gitem_t *item)
 	edict_t	*dropped;
 	int		index;
 
+	if (!ent || !item)
+	{
+		return;
+	}
+
 	index = ITEM_INDEX(item);
 	dropped = Drop_Item (ent, item);
 	if (ent->client->pers.inventory[index] >= item->quantity)
@@ -601,6 +681,11 @@ void Drop_Ammo (edict_t *ent, gitem_t *item)
 
 qboolean Pickup_A2k (edict_t *ent, edict_t *other)
 {
+	if (!ent || !other)
+	{
+		return false;
+	}
+
 	// do we already have an a2k?
 	if (other->client->pers.inventory[ITEM_INDEX(ent->item)] == 1)
 	{
@@ -623,6 +708,11 @@ qboolean Pickup_A2k (edict_t *ent, edict_t *other)
 
 void MegaHealth_think (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->owner->health > self->owner->max_health)
 	{
 		self->nextthink = level.time + 1;
@@ -638,6 +728,11 @@ void MegaHealth_think (edict_t *self)
 
 qboolean Pickup_Health (edict_t *ent, edict_t *other)
 {
+	if (!ent || !other)
+	{
+		return false;
+	}
+
 	if (!(ent->style & HEALTH_IGNORE_MAX))
 		if (other->health >= other->max_health)
 			return false;
@@ -681,6 +776,11 @@ qboolean Pickup_Health (edict_t *ent, edict_t *other)
 
 int ArmorIndex (edict_t *ent)
 {
+	if (!ent)
+	{
+		return 0;
+	}
+
 	if (!ent->client)
 		return 0;
 
@@ -705,6 +805,11 @@ qboolean Pickup_Armor (edict_t *ent, edict_t *other)
 	float			salvage;
 	int				salvagecount;
 
+	if (!ent || !other)
+	{
+		return false;
+	}
+
 	// get info on new armor
 	newinfo = (gitem_armor_t *)ent->item->info;
 
@@ -779,6 +884,11 @@ qboolean Pickup_Armor (edict_t *ent, edict_t *other)
 
 int PowerArmorType (edict_t *ent)
 {
+	if (!ent)
+	{
+		return 0;
+	}
+
 	if (!ent->client)
 		return POWER_ARMOR_NONE;
 
@@ -798,6 +908,11 @@ void Use_PowerArmor (edict_t *ent, gitem_t *item)
 {
 	int		index;
 
+	if (!ent || !item)
+	{
+		return;
+	}
+
 	if (ent->flags & FL_POWER_ARMOR)
 	{
 		ent->flags &= ~FL_POWER_ARMOR;
@@ -820,6 +935,11 @@ qboolean Pickup_PowerArmor (edict_t *ent, edict_t *other)
 {
 	int		quantity;
 
+	if (!ent || !other)
+	{
+		return false;
+	}
+
 	quantity = other->client->pers.inventory[ITEM_INDEX(ent->item)];
 
 	other->client->pers.inventory[ITEM_INDEX(ent->item)]++;
@@ -838,6 +958,11 @@ qboolean Pickup_PowerArmor (edict_t *ent, edict_t *other)
 
 void Drop_PowerArmor (edict_t *ent, gitem_t *item)
 {
+	if (!ent || !item)
+	{
+		return;
+	}
+
 	if ((ent->flags & FL_POWER_ARMOR) && (ent->client->pers.inventory[ITEM_INDEX(item)] == 1))
 		Use_PowerArmor (ent, item);
 	Drop_General (ent, item);
@@ -847,6 +972,11 @@ void Drop_PowerArmor (edict_t *ent, gitem_t *item)
 
 qboolean Pickup_PlasmaShield(edict_t *ent, edict_t *other)
 {
+	if (!ent || !other)
+	{
+		return false;
+	}
+
 	if(other->client->pers.inventory[ITEM_INDEX(ent->item)])
 	{
 		return false;
@@ -866,6 +996,11 @@ qboolean Pickup_PlasmaShield(edict_t *ent, edict_t *other)
 
 qboolean Pickup_Visor(edict_t *ent, edict_t *other)
 {
+	if (!ent || !other)
+	{
+		return false;
+	}
+
 	// do we already have a visor?
 	if (other->client->pers.inventory[ITEM_INDEX(ent->item)] == 1 &&
 		other->client->pers.visorFrames == 300)
@@ -891,6 +1026,11 @@ qboolean Pickup_Visor(edict_t *ent, edict_t *other)
 
 void Drop_Visor(edict_t *ent, gitem_t *item)
 {
+	if (!ent || !item)
+	{
+		return;
+	}
+
 	edict_t *visor = Drop_Item (ent, item);
 	ent->client->pers.inventory[ITEM_INDEX(item)] = 0;
 	ValidateSelectedItem (ent);
@@ -909,6 +1049,11 @@ void Touch_Item (edict_t *ent, edict_t *other, cplane_t *plane, csurface_t *surf
 {
 	qboolean	taken;
 
+	if (!ent || !other)
+	{
+		return;
+	}
+
 	if (!other->client)
 		return;
 	if (other->health < 1)
@@ -957,6 +1102,11 @@ void Touch_Item (edict_t *ent, edict_t *other, cplane_t *plane, csurface_t *surf
 
 void drop_temp_touch (edict_t *ent, edict_t *other, cplane_t *plane, csurface_t *surf)
 {
+	if (!ent || !other)
+	{
+		return;
+	}
+
 	if (other == ent->owner)
 		return;
 
@@ -965,6 +1115,11 @@ void drop_temp_touch (edict_t *ent, edict_t *other, cplane_t *plane, csurface_t
 
 void drop_make_touchable (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->touch = Touch_Item;
 	if (deathmatch->value)
 	{
@@ -979,6 +1134,11 @@ edict_t *Drop_Item (edict_t *ent, gitem_t *item)
 	vec3_t	forward, right;
 	vec3_t	offset;
 
+	if (!ent || !item)
+	{
+		return NULL;
+	}
+
 	dropped = G_Spawn();
 
 	dropped->classname = item->classname;
@@ -1024,6 +1184,11 @@ edict_t *Drop_Item (edict_t *ent, gitem_t *item)
 
 void Use_Item (edict_t *ent, edict_t *other, edict_t *activator)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->svflags &= ~SVF_NOCLIENT;
 	ent->use = NULL;
 
@@ -1054,6 +1219,11 @@ void droptofloor (edict_t *ent)
 	vec3_t		dest;
 	float		*v;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	v = tv(-15,-15,-15);
 	VectorCopy (v, ent->mins);
 	v = tv(15,15,15);
@@ -1193,6 +1363,11 @@ be on an entity that hasn't spawned yet.
 */
 void SpawnItem (edict_t *ent, gitem_t *item)
 {
+	if (!ent || !item)
+	{
+		return;
+	}
+
 	PrecacheItem (item);
 
 	if (ent->spawnflags)
@@ -2590,6 +2765,11 @@ security pass for the security level
 */
 void SP_item_health (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if ( deathmatch->value && ((int)dmflags->value & DF_NO_HEALTH) )
 	{
 		G_FreeEdict (self);
@@ -2606,6 +2786,11 @@ void SP_item_health (edict_t *self)
 */
 void SP_item_health_small (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if ( deathmatch->value && ((int)dmflags->value & DF_NO_HEALTH) )
 	{
 		G_FreeEdict (self);
@@ -2623,6 +2808,11 @@ void SP_item_health_small (edict_t *self)
 */
 void SP_item_health_large (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if ( deathmatch->value && ((int)dmflags->value & DF_NO_HEALTH) )
 	{
 		G_FreeEdict (self);
@@ -2639,6 +2829,11 @@ void SP_item_health_large (edict_t *self)
 */
 void SP_item_health_mega (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if ( deathmatch->value && ((int)dmflags->value & DF_NO_HEALTH) )
 	{
 		G_FreeEdict (self);

src/g_misc.c

@@ -13,6 +13,11 @@ Used to group brushes together just for editor convenience.
 
 void Use_Areaportal (edict_t *ent, edict_t *other, edict_t *activator)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->count ^= 1;		// toggle state
 //	gi.dprintf ("portalstate: %i = %i\n", ent->style, ent->count);
 	gi.SetAreaPortalState (ent->style, ent->count);
@@ -26,6 +31,11 @@ Usually enclosed in the middle of a door.
 */
 void SP_func_areaportal (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->use = Use_Areaportal;
 	ent->count = 0;		// always start closed;
 }
@@ -52,6 +62,11 @@ void VelocityForDamage (int damage, vec3_t v)
 
 void ClipGibVelocity (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->velocity[0] < -300)
 		ent->velocity[0] = -300;
 	else if (ent->velocity[0] > 300)
@@ -74,6 +89,11 @@ gibs
 */
 void gib_think (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->s.frame++;
 	self->nextthink = level.time + FRAMETIME;
 
@@ -88,6 +108,11 @@ void gib_touch (edict_t *self, edict_t *other, cplane_t *plane, csurface_t *surf
 {
 	vec3_t	normal_angles, right;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (!self->groundentity)
 		return;
 
@@ -112,6 +137,11 @@ void gib_touch (edict_t *self, edict_t *other, cplane_t *plane, csurface_t *surf
 
 void gib_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damage, vec3_t point)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	G_FreeEdict (self);
 }
 
@@ -123,6 +153,11 @@ void ThrowGib (edict_t *self, char *gibname, int damage, int type)
 	vec3_t	size;
 	float	vscale;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (!self || !gibname)
 	{
 		return;
@@ -186,6 +221,11 @@ void ThrowHead (edict_t *self, char *gibname, int damage, int type)
 	vec3_t	vd;
 	float	vscale;
 
+	if (!self)
+	{
+		return;
+	}
+
 	self->s.skinnum = 0;
 	self->s.frame = 0;
 	VectorClear (self->mins);
@@ -232,6 +272,11 @@ void ThrowClientHead (edict_t *self, int damage)
 	vec3_t	vd;
 	char	*gibname;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (rand()&1)
 	{
 		gibname = "models/objects/gibs/head2/tris.md2";
@@ -276,6 +321,11 @@ debris
 */
 void debris_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damage, vec3_t point)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	G_FreeEdict (self);
 }
 
@@ -284,6 +334,11 @@ void ThrowDebris (edict_t *self, char *modelname, float speed, vec3_t origin)
 	edict_t	*chunk;
 	vec3_t	v;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (!self || !modelname)
 	{
 		return;
@@ -327,6 +382,11 @@ void ThrowDebris (edict_t *self, char *modelname, float speed, vec3_t origin)
 
 void BecomeExplosion1 (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.WriteByte (svc_temp_entity);
 	gi.WriteByte (TE_EXPLOSION1);
 	gi.WritePosition (self->s.origin);
@@ -338,6 +398,11 @@ void BecomeExplosion1 (edict_t *self)
 
 void BecomeExplosion2 (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.WriteByte (svc_temp_entity);
 	gi.WriteByte (TE_EXPLOSION2);
 	gi.WritePosition (self->s.origin);
@@ -358,6 +423,11 @@ void path_corner_touch (edict_t *self, edict_t *other, cplane_t *plane, csurface
 	vec3_t		v;
 	edict_t		*next;
 
+	if (!self || !other)
+	{
+		return;
+	}
+
 	if (other->movetarget != self)
 		return;
 	
@@ -417,6 +487,11 @@ void path_corner_touch (edict_t *self, edict_t *other, cplane_t *plane, csurface
 
 void SP_path_corner (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!self->targetname)
 	{
 		gi.dprintf ("path_corner with no targetname at %s\n", vtos(self->s.origin));
@@ -442,6 +517,11 @@ void point_combat_touch (edict_t *self, edict_t *other, cplane_t *plane, csurfac
 {
 	edict_t	*activator;
 
+	if (!self || !other)
+	{
+		return;
+	}
+
 	if (other->movetarget != self)
 		return;
 
@@ -492,6 +572,11 @@ void point_combat_touch (edict_t *self, edict_t *other, cplane_t *plane, csurfac
 
 void SP_point_combat (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);
@@ -511,12 +596,22 @@ Just for the debugging level.  Don't use
 */
 void TH_viewthing(edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->s.frame = (ent->s.frame + 1) % 7;
 	ent->nextthink = level.time + FRAMETIME;
 }
 
 void SP_viewthing(edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	gi.dprintf ("viewthing spawned\n");
 
 	ent->movetype = MOVETYPE_NONE;
@@ -537,6 +632,11 @@ Used as a positional target for spotlights, etc.
 */
 void SP_info_null (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	G_FreeEdict (self);
 }
 
@@ -546,6 +646,11 @@ Used as a positional target for lightning.
 */
 void SP_info_notnull (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	VectorCopy (self->s.origin, self->absmin);
 	VectorCopy (self->s.origin, self->absmax);
 }
@@ -563,6 +668,11 @@ Default _cone value is 10 (used to set size of light for spotlights)
 
 void light_use (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->spawnflags & START_OFF)
 	{
 		gi.configstring (CS_LIGHTS+self->style, "m");
@@ -577,6 +687,11 @@ void light_use (edict_t *self, edict_t *other, edict_t *activator)
 
 void SP_light (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	// no targeted lights in deathmatch, because they cause global messages
 	if (!self->targetname || deathmatch->value)
 	{
@@ -611,6 +726,11 @@ START_ON		only valid for TRIGGER_SPAWN walls
 
 void func_wall_use (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->solid == SOLID_NOT)
 	{
 		self->solid = SOLID_BSP;
@@ -630,6 +750,11 @@ void func_wall_use (edict_t *self, edict_t *other, edict_t *activator)
 
 void SP_func_wall (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->movetype = MOVETYPE_PUSH;
 	gi.setmodel (self, self->model);
 
@@ -682,6 +807,11 @@ This is solid bmodel that will fall if it's support it removed.
 
 void func_object_touch (edict_t *self, edict_t *other, cplane_t *plane, csurface_t *surf)
 {
+	if (!self || !other)
+	{
+		return;
+	}
+
 	// only squash thing we fall on top of
 	if (!plane)
 		return;
@@ -694,12 +824,22 @@ void func_object_touch (edict_t *self, edict_t *other, cplane_t *plane, csurface
 
 void func_object_release (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->movetype = MOVETYPE_TOSS;
 	self->touch = func_object_touch;
 }
 
 void func_object_use (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->solid = SOLID_BSP;
 	self->svflags &= ~SVF_NOCLIENT;
 	self->use = NULL;
@@ -709,6 +849,11 @@ void func_object_use (edict_t *self, edict_t *other, edict_t *activator)
 
 void SP_func_object (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.setmodel (self, self->model);
 
 	self->mins[0] += 1;
@@ -768,6 +913,11 @@ void func_explosive_explode (edict_t *self, edict_t *inflictor, edict_t *attacke
 	int		count;
 	int		mass;
 
+	if (!self || !inflictor || !attacker)
+	{
+		return;
+	}
+
 	// bmodel origins are (0 0 0), we need to adjust that here
 	VectorScale (self->size, 0.5, size);
 	VectorAdd (self->absmin, size, origin);
@@ -826,11 +976,21 @@ void func_explosive_explode (edict_t *self, edict_t *inflictor, edict_t *attacke
 
 void func_explosive_use(edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self || !other)
+	{
+		return;
+	}
+
 	func_explosive_explode (self, self, other, self->health, vec3_origin);
 }
 
 void func_explosive_spawn (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->solid = SOLID_BSP;
 	self->svflags &= ~SVF_NOCLIENT;
 	self->use = NULL;
@@ -840,6 +1000,11 @@ void func_explosive_spawn (edict_t *self, edict_t *other, edict_t *activator)
 
 void SP_func_explosive (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{	// auto-remove for deathmatch
 		G_FreeEdict (self);
@@ -888,14 +1053,19 @@ Large exploding box.  You can override its mass (100),
 health (80), and dmg (150).
 */
 qboolean SV_movestep (edict_t *ent, vec3_t move, qboolean relink);
-void barrel_touch (edict_t *self, edict_t *other, cplane_t *plane, csurface_t *surf)
 
+void barrel_touch (edict_t *self, edict_t *other, cplane_t *plane, csurface_t *surf)
 {
 	float	ratio;
 	vec3_t	v;
 	vec3_t	move;
 	float yaw, dist;
 
+	if (!self || !other)
+	{
+		return;
+	}
+
 	if (other->groundentity == self || !other->client)
 		return;
 
@@ -919,6 +1089,11 @@ void barrel_explode (edict_t *self)
 	float	spd;
 	vec3_t	save;
 
+	if (!self)
+	{
+		return;
+	}
+
 	T_RadiusDamage (self, self->activator, self->dmg, NULL, self->dmg+40, MOD_BARREL);
 
 	VectorCopy (self->s.origin, save);
@@ -994,6 +1169,11 @@ void barrel_explode (edict_t *self)
 
 void barrel_delay (edict_t *self, edict_t *inflictor, edict_t *attacker, int damage, vec3_t point)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->takedamage = DAMAGE_NO;
 	self->nextthink = level.time + 2 * FRAMETIME;
 	self->think = barrel_explode;
@@ -1002,6 +1182,11 @@ void barrel_delay (edict_t *self, edict_t *inflictor, edict_t *attacker, int dam
 
 void SP_misc_explobox (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{	// auto-remove for deathmatch
 		G_FreeEdict (self);
@@ -1049,6 +1234,11 @@ void SP_misc_explobox (edict_t *self)
 
 void misc_blackhole_use (edict_t *ent, edict_t *other, edict_t *activator)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	/*
 	gi.WriteByte (svc_temp_entity);
 	gi.WriteByte (TE_BOSSTPORT);
@@ -1060,6 +1250,11 @@ void misc_blackhole_use (edict_t *ent, edict_t *other, edict_t *activator)
 
 void misc_blackhole_think (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (++self->s.frame < 19)
 		self->nextthink = level.time + FRAMETIME;
 	else
@@ -1071,6 +1266,11 @@ void misc_blackhole_think (edict_t *self)
 
 void SP_misc_blackhole (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->movetype = MOVETYPE_NONE;
 	ent->solid = SOLID_NOT;
 	VectorSet (ent->mins, -64, -64, 0);
@@ -1088,6 +1288,11 @@ void SP_misc_blackhole (edict_t *ent)
 
 void misc_eastertank_think (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (++self->s.frame < 293)
 		self->nextthink = level.time + FRAMETIME;
 	else
@@ -1099,6 +1304,11 @@ void misc_eastertank_think (edict_t *self)
 
 void SP_misc_eastertank (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->movetype = MOVETYPE_NONE;
 	ent->solid = SOLID_BBOX;
 	VectorSet (ent->mins, -32, -32, -16);
@@ -1116,6 +1326,11 @@ void SP_misc_eastertank (edict_t *ent)
 
 void misc_easterchick_think (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (++self->s.frame < 247)
 		self->nextthink = level.time + FRAMETIME;
 	else
@@ -1127,6 +1342,11 @@ void misc_easterchick_think (edict_t *self)
 
 void SP_misc_easterchick (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->movetype = MOVETYPE_NONE;
 	ent->solid = SOLID_BBOX;
 	VectorSet (ent->mins, -32, -32, 0);
@@ -1144,6 +1364,11 @@ void SP_misc_easterchick (edict_t *ent)
 
 void misc_easterchick2_think (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (++self->s.frame < 287)
 		self->nextthink = level.time + FRAMETIME;
 	else
@@ -1155,6 +1380,11 @@ void misc_easterchick2_think (edict_t *self)
 
 void SP_misc_easterchick2 (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->movetype = MOVETYPE_NONE;
 	ent->solid = SOLID_BBOX;
 	VectorSet (ent->mins, -32, -32, 0);
@@ -1174,6 +1404,11 @@ There should be a item_commander_head that has this as it's target.
 
 void commander_body_think (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (++self->s.frame < 24)
 		self->nextthink = level.time + FRAMETIME;
 	else
@@ -1185,6 +1420,11 @@ void commander_body_think (edict_t *self)
 
 void commander_body_use (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->think = commander_body_think;
 	self->nextthink = level.time + FRAMETIME;
 	gi.sound (self, CHAN_BODY, gi.soundindex ("tank/pain.wav"), 1, ATTN_NORM, 0);
@@ -1192,12 +1432,22 @@ void commander_body_use (edict_t *self, edict_t *other, edict_t *activator)
 
 void commander_body_drop (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->movetype = MOVETYPE_TOSS;
 	self->s.origin[2] += 2;
 }
 
 void SP_monster_commander_body (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->movetype = MOVETYPE_NONE;
 	self->solid = SOLID_BBOX;
 	self->model = "models/monsters/commandr/tris.md2";
@@ -1224,12 +1474,22 @@ The banner is 128 tall.
 */
 void misc_banner_think (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->s.frame = (ent->s.frame + 1) % 16;
 	ent->nextthink = level.time + FRAMETIME;
 }
 
 void SP_misc_banner (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->movetype = MOVETYPE_NONE;
 	ent->solid = SOLID_NOT;
 	ent->s.modelindex = gi.modelindex ("models/objects/banner/tris.md2");
@@ -1247,6 +1507,11 @@ void misc_deadsoldier_die (edict_t *self, edict_t *inflictor, edict_t *attacker,
 {
 	int		n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->health > -80)
 		return;
 
@@ -1258,6 +1523,11 @@ void misc_deadsoldier_die (edict_t *self, edict_t *inflictor, edict_t *attacker,
 
 void SP_misc_deadsoldier (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{	// auto-remove for deathmatch
 		G_FreeEdict (ent);
@@ -1306,6 +1576,11 @@ extern void func_train_find (edict_t *self);
 
 void misc_viper_use  (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self || !other || !activator)
+	{
+		return;
+	}
+
 	self->svflags &= ~SVF_NOCLIENT;
 	self->use = train_use;
 	train_use (self, other, activator);
@@ -1313,6 +1588,11 @@ void misc_viper_use  (edict_t *self, edict_t *other, edict_t *activator)
 
 void SP_misc_viper (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if (!ent->target)
 	{
 		gi.dprintf ("misc_viper without a target at %s\n", vtos(ent->absmin));
@@ -1385,6 +1665,11 @@ This is a large stationary viper as seen in Paul's intro
 */
 void SP_misc_bigviper (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->movetype = MOVETYPE_NONE;
 	ent->solid = SOLID_BBOX;
 	VectorSet (ent->mins, -176, -120, -24);
@@ -1399,6 +1684,11 @@ void SP_misc_bigviper (edict_t *ent)
 */
 void misc_viper_bomb_touch (edict_t *self, edict_t *other, cplane_t *plane, csurface_t *surf)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	G_UseTargets (self, self->activator);
 
 	self->s.origin[2] = self->absmin[2] + 1;
@@ -1411,6 +1701,11 @@ void misc_viper_bomb_prethink (edict_t *self)
 	vec3_t	v;
 	float	diff;
 
+	if (!self)
+	{
+		return;
+	}
+
 	self->groundentity = NULL;
 
 	diff = self->timestamp - level.time;
@@ -1429,6 +1724,11 @@ void misc_viper_bomb_use (edict_t *self, edict_t *other, edict_t *activator)
 {
 	edict_t	*viper;
 
+	if (!self || !activator)
+	{
+		return;
+	}
+
 	self->solid = SOLID_BBOX;
 	self->svflags &= ~SVF_NOCLIENT;
 	self->s.effects |= EF_ROCKET;
@@ -1447,6 +1747,11 @@ void misc_viper_bomb_use (edict_t *self, edict_t *other, edict_t *activator)
 
 void SP_misc_viper_bomb (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->movetype = MOVETYPE_NONE;
 	self->solid = SOLID_NOT;
 	VectorSet (self->mins, -8, -8, -8);
@@ -1477,6 +1782,11 @@ extern void func_train_find (edict_t *self);
 
 void misc_strogg_ship_use  (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self || !other || !activator)
+	{
+		return;
+	}
+
 	self->svflags &= ~SVF_NOCLIENT;
 	self->use = train_use;
 	train_use (self, other, activator);
@@ -1484,6 +1794,11 @@ void misc_strogg_ship_use  (edict_t *self, edict_t *other, edict_t *activator)
 
 void SP_misc_strogg_ship (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if (!ent->target)
 	{
 		gi.dprintf ("%s without a target at %s\n", ent->classname, vtos(ent->absmin));
@@ -1514,6 +1829,11 @@ void SP_misc_strogg_ship (edict_t *ent)
 */
 void misc_satellite_dish_think (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->s.frame++;
 	if (self->s.frame < 38)
 		self->nextthink = level.time + FRAMETIME;
@@ -1521,6 +1841,11 @@ void misc_satellite_dish_think (edict_t *self)
 
 void misc_satellite_dish_use (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->s.frame = 0;
 	self->think = misc_satellite_dish_think;
 	self->nextthink = level.time + FRAMETIME;
@@ -1528,6 +1853,11 @@ void misc_satellite_dish_use (edict_t *self, edict_t *other, edict_t *activator)
 
 void SP_misc_satellite_dish (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->movetype = MOVETYPE_NONE;
 	ent->solid = SOLID_BBOX;
 	VectorSet (ent->mins, -64, -64, 0);
@@ -1542,6 +1872,11 @@ void SP_misc_satellite_dish (edict_t *ent)
 */
 void SP_light_mine1 (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->movetype = MOVETYPE_NONE;
 	ent->solid = SOLID_BBOX;
 	ent->s.modelindex = gi.modelindex ("models/objects/minelite/light1/tris.md2");
@@ -1553,6 +1888,11 @@ void SP_light_mine1 (edict_t *ent)
 */
 void SP_light_mine2 (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->movetype = MOVETYPE_NONE;
 	ent->solid = SOLID_BBOX;
 	ent->s.modelindex = gi.modelindex ("models/objects/minelite/light2/tris.md2");
@@ -1565,6 +1905,11 @@ Intended for use with the target_spawner
 */
 void SP_misc_gib_arm (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	gi.setmodel (ent, "models/objects/gibs/arm/tris.md2");
 	ent->solid = SOLID_NOT;
 	ent->s.effects |= EF_GIB;
@@ -1586,6 +1931,11 @@ Intended for use with the target_spawner
 */
 void SP_misc_gib_leg (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	gi.setmodel (ent, "models/objects/gibs/leg/tris.md2");
 	ent->solid = SOLID_NOT;
 	ent->s.effects |= EF_GIB;
@@ -1607,6 +1957,11 @@ Intended for use with the target_spawner
 */
 void SP_misc_gib_head (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	gi.setmodel (ent, "models/objects/gibs/head/tris.md2");
 	ent->solid = SOLID_NOT;
 	ent->s.effects |= EF_GIB;
@@ -1632,6 +1987,11 @@ used with target_string (must be on same "team")
 
 void SP_target_character (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->movetype = MOVETYPE_PUSH;
 	gi.setmodel (self, self->model);
 	self->solid = SOLID_BSP;
@@ -1650,6 +2010,11 @@ void target_string_use (edict_t *self, edict_t *other, edict_t *activator)
 	int		n, l;
 	char	c;
 
+	if (!self)
+	{
+		return;
+	}
+
 	l = strlen(self->message);
 	for (e = self->teammaster; e; e = e->teamchain)
 	{
@@ -1676,6 +2041,11 @@ void target_string_use (edict_t *self, edict_t *other, edict_t *activator)
 
 void SP_target_string (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!self->message)
 		self->message = "";
 	self->use = target_string_use;
@@ -1702,6 +2072,11 @@ If START_OFF, this entity must be used before it starts
 
 void func_clock_reset (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->activator = NULL;
 	if (self->spawnflags & 1)
 	{
@@ -1717,6 +2092,11 @@ void func_clock_reset (edict_t *self)
 
 void func_clock_format_countdown (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->style == 0)
 	{
 		Com_sprintf (self->message, CLOCK_MESSAGE_SIZE, "%2i", self->health);
@@ -1744,6 +2124,11 @@ void func_clock_format_countdown (edict_t *self)
 
 void func_clock_think (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!self->enemy)
 	{
 		self->enemy = G_Find (NULL, FOFS(targetname), self->target);
@@ -1809,6 +2194,11 @@ void func_clock_think (edict_t *self)
 
 void func_clock_use (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self || !activator)
+	{
+		return;
+	}
+
 	if (!(self->spawnflags & 8))
 		self->use = NULL;
 	if (self->activator)
@@ -1819,6 +2209,11 @@ void func_clock_use (edict_t *self, edict_t *other, edict_t *activator)
 
 void SP_func_clock (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!self->target)
 	{
 		gi.dprintf("%s with no target at %s\n", self->classname, vtos(self->s.origin));
@@ -1855,6 +2250,11 @@ void teleporter_touch (edict_t *self, edict_t *other, cplane_t *plane, csurface_
 	edict_t		*dest;
 	int			i;
 
+	if (!self || !other)
+	{
+		return;
+	}
+
 	if (!other->client)
 		return;
 	dest = G_Find (NULL, FOFS(targetname), self->target);
@@ -1903,6 +2303,11 @@ void SP_misc_teleporter (edict_t *ent)
 {
 	edict_t		*trig;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (!ent->target)
 	{
 		gi.dprintf ("teleporter without a target.\n");
@@ -1937,6 +2342,11 @@ Point teleporters at these.
 */
 void SP_misc_teleporter_dest (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	gi.setmodel (ent, "models/objects/dmspot/tris.md2");
 	ent->s.skinnum = 0;
 	ent->solid = SOLID_BBOX;

src/g_monster.c

@@ -10,6 +10,11 @@
 // the damages too, but I'm not sure that's such a good idea.
 void monster_fire_bullet (edict_t *self, vec3_t start, vec3_t dir, int damage, int kick, int hspread, int vspread, int flashtype)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	ANIM_AIM(self, dir);
 	fire_bullet (self, start, dir, damage, kick, hspread, vspread, MOD_UNKNOWN);
 
@@ -21,6 +26,11 @@ void monster_fire_bullet (edict_t *self, vec3_t start, vec3_t dir, int damage, i
 
 void monster_fire_shotgun (edict_t *self, vec3_t start, vec3_t aimdir, int damage, int kick, int hspread, int vspread, int count, int flashtype)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	ANIM_AIM(self, aimdir);
 	fire_shotgun (self, start, aimdir, damage, kick, hspread, vspread, count, MOD_UNKNOWN);
 
@@ -32,7 +42,12 @@ void monster_fire_shotgun (edict_t *self, vec3_t start, vec3_t aimdir, int damag
 
 void monster_fire_blaster (edict_t *self, vec3_t start, vec3_t dir, int damage, int speed, int flashtype, int effect)
 {
-	if(EMPNukeCheck(self, start))
+	if (!self)
+	{
+		return;
+	}
+
+	if (EMPNukeCheck(self, start))
 	{
 		gi.sound (self, CHAN_AUTO, gi.soundindex("items/empnuke/emp_missfire.wav"), 1, ATTN_NORM, 0);
 		return;
@@ -49,6 +64,11 @@ void monster_fire_blaster (edict_t *self, vec3_t start, vec3_t dir, int damage,
 
 void monster_fire_grenade (edict_t *self, vec3_t start, vec3_t aimdir, int damage, int speed, int flashtype)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	ANIM_AIM(self, aimdir);
 	fire_grenade (self, start, aimdir, damage, speed, 2.5, damage+40);
 
@@ -60,7 +80,12 @@ void monster_fire_grenade (edict_t *self, vec3_t start, vec3_t aimdir, int damag
 
 void monster_fire_rocket (edict_t *self, vec3_t start, vec3_t dir, int damage, int speed, int flashtype)
 {
-	if(EMPNukeCheck(self, start))
+	if (!self)
+	{
+		return;
+	}
+
+	if (EMPNukeCheck(self, start))
 	{
 		gi.sound (self, CHAN_AUTO, gi.soundindex("items/empnuke/emp_missfire.wav"), 1, ATTN_NORM, 0);
 		return;
@@ -77,7 +102,12 @@ void monster_fire_rocket (edict_t *self, vec3_t start, vec3_t dir, int damage, i
 
 void monster_fire_railgun (edict_t *self, vec3_t start, vec3_t aimdir, int damage, int kick, int flashtype)
 {
-	if(EMPNukeCheck(self, start))
+	if (!self)
+	{
+		return;
+	}
+
+	if (EMPNukeCheck(self, start))
 	{
 		gi.sound (self, CHAN_AUTO, gi.soundindex("items/empnuke/emp_missfire.wav"), 1, ATTN_NORM, 0);
 		return;
@@ -94,7 +124,12 @@ void monster_fire_railgun (edict_t *self, vec3_t start, vec3_t aimdir, int damag
 
 void monster_fire_bfg (edict_t *self, vec3_t start, vec3_t aimdir, int damage, int speed, int kick, float damage_radius, int flashtype)
 {
-	if(EMPNukeCheck(self, start))
+	if (!self)
+	{
+		return;
+	}
+
+	if (EMPNukeCheck(self, start))
 	{
 		gi.sound (self, CHAN_AUTO, gi.soundindex("items/empnuke/emp_missfire.wav"), 1, ATTN_NORM, 0);
 		return;
@@ -117,14 +152,25 @@ void monster_fire_bfg (edict_t *self, vec3_t start, vec3_t aimdir, int damage, i
 
 void M_FliesOff (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->s.effects &= ~EF_FLIES;
 	self->s.sound = 0;
 }
 
 void M_FliesOn (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->waterlevel)
 		return;
+
 	self->s.effects |= EF_FLIES;
 	self->s.sound = gi.soundindex ("infantry/inflies1.wav");
 	self->think = M_FliesOff;
@@ -133,6 +179,11 @@ void M_FliesOn (edict_t *self)
 
 void M_FlyCheck (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->waterlevel)
 		return;
 
@@ -145,6 +196,11 @@ void M_FlyCheck (edict_t *self)
 
 void AttackFinished (edict_t *self, float time)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.attack_finished = level.time + time;
 }
 
@@ -154,6 +210,11 @@ void M_CheckGround (edict_t *ent)
 	vec3_t		point;
 	trace_t		trace;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->flags & (FL_SWIM|FL_FLY))
 		return;
 
@@ -192,6 +253,11 @@ void M_CatagorizePosition (edict_t *ent)
 	vec3_t		point;
 	int			cont;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	//
 	// get waterlevel
 	//
@@ -226,6 +292,11 @@ void M_WorldEffects (edict_t *ent)
 {
 	int		dmg;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->health > 0)
 	{
 		if (!(ent->flags & FL_SWIM))
@@ -319,6 +390,11 @@ void M_droptofloor (edict_t *ent)
 	vec3_t		end;
 	trace_t		trace;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->s.origin[2] += 1;
 	VectorCopy (ent->s.origin, end);
 	end[2] -= 256;
@@ -338,6 +414,11 @@ void M_droptofloor (edict_t *ent)
 
 void M_SetEffects (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->s.effects &= ~(EF_COLOR_SHELL|EF_POWERSCREEN);
 	ent->s.renderfx &= ~(RF_SHELL_RED|RF_SHELL_GREEN|RF_SHELL_BLUE);
 
@@ -367,6 +448,11 @@ void M_SetEffects (edict_t *ent)
 qboolean FindTarget (edict_t *self);
 void M_MoveFrame (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	mmove_t	*move;
 	int		index;
 
@@ -427,6 +513,11 @@ void M_MoveFrame (edict_t *self)
 
 void monster_think (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	M_MoveFrame (self);
 	if (self->linkcount != self->monsterinfo.linkcount)
 	{
@@ -452,6 +543,11 @@ Using a monster makes it angry at the current activator
 */
 void monster_use (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self || !activator)
+	{
+		return;
+	}
+
 	if (self->enemy)
 		return;
 	if (self->health <= 0)
@@ -472,6 +568,11 @@ void monster_start_go (edict_t *self);
 
 void monster_triggered_spawn (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->s.origin[2] += 1;
 	MonsterKillBox (self);
 
@@ -500,6 +601,11 @@ void monster_triggered_spawn (edict_t *self)
 
 void monster_triggered_spawn_use (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self || !activator)
+	{
+		return;
+	}
+
 	// we have a one frame delay here so we don't telefrag the guy who activated us
 	self->think = monster_triggered_spawn;
 	self->nextthink = level.time + FRAMETIME;
@@ -510,6 +616,11 @@ void monster_triggered_spawn_use (edict_t *self, edict_t *other, edict_t *activa
 
 void monster_triggered_start (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->solid = SOLID_NOT;
 	self->movetype = MOVETYPE_NONE;
 	self->svflags |= SVF_NOCLIENT;
@@ -528,6 +639,11 @@ enemy as activator.
 */
 void monster_death_use (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->flags &= ~(FL_FLY|FL_SWIM);
 	self->monsterinfo.aiflags &= AI_GOOD_GUY;
 
@@ -551,6 +667,11 @@ void monster_death_use (edict_t *self)
 
 qboolean monster_start (edict_t *self)
 {
+	if (!self)
+	{
+		return false;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);
@@ -606,6 +727,11 @@ void monster_start_go (edict_t *self)
 {
 	vec3_t	v;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->health <= 0)
 		return;
 
@@ -692,6 +818,11 @@ void monster_start_go (edict_t *self)
 
 void walkmonster_start_go (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!(self->spawnflags & 2) && level.time < 1)
 	{
 		M_droptofloor (self);
@@ -713,6 +844,11 @@ void walkmonster_start_go (edict_t *self)
 
 void walkmonster_start (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->think = walkmonster_start_go;
 	monster_start (self);
 }
@@ -720,6 +856,11 @@ void walkmonster_start (edict_t *self)
 
 void flymonster_start_go (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!M_walkmove (self, 0, 0))
 		gi.dprintf ("%s in solid at %s\n", self->classname, vtos(self->s.origin));
 
@@ -736,6 +877,11 @@ void flymonster_start_go (edict_t *self)
 
 void flymonster_start (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->flags |= FL_FLY;
 	self->think = flymonster_start_go;
 	monster_start (self);
@@ -744,6 +890,11 @@ void flymonster_start (edict_t *self)
 
 void swimmonster_start_go (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!self->yaw_speed)
 		self->yaw_speed = 10;
 	self->viewheight = 10;
@@ -756,6 +907,11 @@ void swimmonster_start_go (edict_t *self)
 
 void swimmonster_start (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->flags |= FL_SWIM;
 	self->think = swimmonster_start_go;
 	monster_start (self);

src/g_phys.c

@@ -32,6 +32,11 @@ edict_t	*SV_TestEntityPosition (edict_t *ent)
 	trace_t	trace;
 	int		mask;
 
+	if (!ent)
+	{
+		return NULL;
+	}
+
 	if (ent->clipmask)
 		mask = ent->clipmask;
 	else
@@ -54,6 +59,11 @@ void SV_CheckVelocity (edict_t *ent)
 {
 	int		i;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	//
 	// bound velocity
 	//
@@ -77,6 +87,11 @@ qboolean SV_RunThink (edict_t *ent)
 {
 	float	thinktime;
 
+	if (!ent)
+	{
+		return false;
+	}
+
 	thinktime = ent->nextthink;
 	if (thinktime <= 0)
 		return true;
@@ -101,7 +116,12 @@ Two entities have touched, so run their touch functions
 void SV_Impact (edict_t *e1, trace_t *trace)
 {
 	edict_t		*e2;
-//	cplane_t	backplane;
+	// cplane_t	backplane;
+
+	if (!e1 || !trace)
+	{
+		return;
+	}
 
 	e2 = trace->ent;
 
@@ -176,6 +196,11 @@ int SV_FlyMove (edict_t *ent, float time, int mask)
 	float		time_left;
 	int			blocked;
 
+	if (!ent)
+	{
+		return 0;
+	}
+
 	numbumps = 4;
 
 	blocked = 0;
@@ -300,6 +325,11 @@ SV_AddGravity
 */
 void SV_AddGravity (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->velocity[2] -= ent->gravity * sv_gravity->value * FRAMETIME;
 }
 
@@ -320,6 +350,11 @@ RealBoundingBox(edict_t *ent, vec3_t mins, vec3_t maxs)
 	vec3_t p[8];
 	int i, j, k, j2, k4;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	for (k = 0; k < 2; k++)
 	{
 		k4 = k * 4;
@@ -502,6 +537,11 @@ qboolean SV_Push (edict_t *pusher, vec3_t move, vec3_t amove)
 	vec3_t		org, org2, move2, forward, right, up;
 	vec3_t		realmins, realmaxs;
 
+	if (!pusher)
+	{
+		return false;
+	}
+
 	// clamp the move to 1/8 units, so the position will
 	// be accurate for client side prediction
 	for (i=0 ; i<3 ; i++)
@@ -663,6 +703,11 @@ void SV_Physics_Pusher (edict_t *ent)
 	vec3_t		move, amove;
 	edict_t		*part, *mv;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	// if not a team captain, so movement will be handled elsewhere
 	if ( ent->flags & FL_TEAMSLAVE)
 		return;
@@ -724,6 +769,11 @@ Non moving objects can only think
 */
 void SV_Physics_None (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	// regular thinking
 	SV_RunThink (ent);
 }
@@ -737,6 +787,11 @@ A moving object that doesn't obey physics
 */
 void SV_Physics_Noclip (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	// regular thinking
 	if (!SV_RunThink (ent))
 		return;
@@ -773,6 +828,11 @@ void SV_Physics_Toss (edict_t *ent)
 	vec3_t		old_origin;
 	float		speed = 0;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	// regular thinking
 	SV_RunThink (ent);
 
@@ -834,10 +894,8 @@ void SV_Physics_Toss (edict_t *ent)
 			VectorNormalize (ent->velocity);
 			VectorScale (ent->velocity, speed, ent->velocity);
 		}
-		else
-
 		// stop if on ground
-		if (trace.plane.normal[2] > 0.7)
+		else if (trace.plane.normal[2] > 0.7)
 		{
 			if (ent->velocity[2] < 60 || ent->movetype != MOVETYPE_BOUNCE)
 			{
@@ -903,6 +961,11 @@ void SV_AddRotationalFriction (edict_t *ent)
 	int		n;
 	float	adjustment;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	VectorMA (ent->s.angles, FRAMETIME, ent->avelocity, ent->s.angles);
 	adjustment = FRAMETIME * sv_stopspeed * sv_friction;
 	for (n = 0; n < 3; n++)
@@ -932,6 +995,11 @@ void SV_Physics_Step (edict_t *ent)
 	edict_t		*groundentity;
 	int			mask;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	// airborn monsters should always check for ground
 	if (!ent->groundentity)
 		M_CheckGround (ent);
@@ -1038,6 +1106,11 @@ void SV_Physics_FallFloat (edict_t *ent)
 	qboolean wasonground = false;
 	qboolean hitsound = false;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	// check velocity
 	SV_CheckVelocity (ent);
 
@@ -1158,7 +1231,6 @@ void SV_Physics_FallFloat (edict_t *ent)
 			gi.positioned_sound (old_origin, g_edicts, CHAN_AUTO, gi.soundindex("misc/h2ohit1.wav"), 1, 1, 0);
 		else if (wasinwater && !isinwater)
 			gi.positioned_sound (ent->s.origin, g_edicts, CHAN_AUTO, gi.soundindex("misc/h2ohit1.wav"), 1, 1, 0);
-
 	}
 
 	// relink
@@ -1172,6 +1244,11 @@ void adjustRiders(edict_t *ent)
 {
 	int i = 0;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	// make sure the offsets are constant
 	for (i = 0; i < 2; i++)
 	{
@@ -1182,6 +1259,11 @@ void adjustRiders(edict_t *ent)
 
 void SV_Physics_Ride (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	// base ourself on the step
 	SV_Physics_Step(ent);
 
@@ -1197,6 +1279,11 @@ G_RunEntity
 */
 void G_RunEntity (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->prethink)
 		ent->prethink (ent);
 

src/g_spawn.c

@@ -311,6 +311,11 @@ void ED_CallSpawn (edict_t *ent)
 		return;
 	}
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (!ent->classname)
 	{
 		gi.dprintf ("ED_CallSpawn: NULL classname\n");
@@ -456,7 +461,7 @@ char *ED_ParseEdict (char *data, edict_t *ent)
 	char		keyname[256];
 	const char	*com_token;
 
-	if (!ent || !data)
+	if (!ent)
 	{
 		return NULL;
 	}
@@ -850,6 +855,11 @@ Only used for the world.
 */
 void SP_worldspawn (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->movetype = MOVETYPE_PUSH;
 	ent->solid = SOLID_BSP;
 	ent->inuse = true;			// since the world doesn't use G_Spawn()

src/g_target.c

@@ -6,6 +6,11 @@ Fire an origin based temp entity event to the clients.
 */
 void Use_Target_Tent (edict_t *ent, edict_t *other, edict_t *activator)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	gi.WriteByte (svc_temp_entity);
 	gi.WriteByte (ent->style);
 	gi.WritePosition (ent->s.origin);
@@ -14,6 +19,11 @@ void Use_Target_Tent (edict_t *ent, edict_t *other, edict_t *activator)
 
 void SP_target_temp_entity (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->use = Use_Target_Tent;
 }
 
@@ -40,6 +50,11 @@ void Use_Target_Speaker (edict_t *ent, edict_t *other, edict_t *activator)
 {
 	int		chan;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->spawnflags & 3)
 	{	// looping sound toggles
 		if (ent->s.sound)
@@ -63,6 +78,11 @@ void SP_target_speaker (edict_t *ent)
 {
 	char	buffer[MAX_QPATH];
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if(!st.noise)
 	{
 		gi.dprintf("target_speaker with no noise set at %s\n", vtos(ent->s.origin));
@@ -98,6 +118,11 @@ void SP_target_speaker (edict_t *ent)
 
 void Use_Target_Help (edict_t *ent, edict_t *other, edict_t *activator)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->spawnflags & 1)
 		strncpy (game.helpmessage1, ent->message, sizeof(game.helpmessage2)-1);
 	else
@@ -111,6 +136,11 @@ When fired, the "message" key becomes the current personal computer string, and
 */
 void SP_target_help(edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{	// auto-remove for deathmatch
 		G_FreeEdict (ent);
@@ -134,6 +164,11 @@ These are single use targets.
 */
 void use_target_secret (edict_t *ent, edict_t *other, edict_t *activator)
 {
+	if (!ent || !activator)
+	{
+		return;
+	}
+
 	gi.sound (ent, CHAN_VOICE, ent->noise_index, 1, ATTN_NORM, 0);
 
 	level.found_secrets++;
@@ -144,6 +179,11 @@ void use_target_secret (edict_t *ent, edict_t *other, edict_t *activator)
 
 void SP_target_secret (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{	// auto-remove for deathmatch
 		G_FreeEdict (ent);
@@ -169,6 +209,11 @@ These are single use targets.
 */
 void use_target_goal (edict_t *ent, edict_t *other, edict_t *activator)
 {
+	if (!ent || !activator)
+	{
+		return;
+	}
+
 	gi.sound (ent, CHAN_VOICE, ent->noise_index, 1, ATTN_NORM, 0);
 
 	level.found_goals++;
@@ -182,6 +227,11 @@ void use_target_goal (edict_t *ent, edict_t *other, edict_t *activator)
 
 void SP_target_goal (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{	// auto-remove for deathmatch
 		G_FreeEdict (ent);
@@ -209,6 +259,11 @@ Spawns an explosion temporary entity when used.
 
 void target_explosion_explode_think(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if(self->s.frame >= 5)
 	{
 		self->svflags |= SVF_NOCLIENT;
@@ -226,6 +281,11 @@ void target_explosion_explode (edict_t *self)
 {
 	float		save;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->spawnflags & EMP_STYLE)
 	{
 		// play the sound
@@ -260,6 +320,11 @@ void target_explosion_explode (edict_t *self)
 
 void use_target_explosion (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self || !activator)
+	{
+		return;
+	}
+
 	self->activator = activator;
 
 	if (!self->delay)
@@ -274,6 +339,11 @@ void use_target_explosion (edict_t *self, edict_t *other, edict_t *activator)
 
 void SP_target_explosion (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	// setup stuff
 	ent->use = use_target_explosion;
 	ent->svflags = SVF_NOCLIENT;
@@ -287,6 +357,11 @@ Changes level to "map" when fired
 */
 void use_target_changelevel (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self || !other || !activator)
+	{
+		return;
+	}
+
 	if (level.intermissiontime)
 		return;		// already activated
 
@@ -319,6 +394,11 @@ void use_target_changelevel (edict_t *self, edict_t *other, edict_t *activator)
 
 void SP_target_changelevel (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if (!ent->map)
 	{
 		gi.dprintf("target_changelevel with no map at %s\n", vtos(ent->s.origin));
@@ -355,6 +435,11 @@ Set "sounds" to one of the following:
 
 void use_target_splash (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self || !activator)
+	{
+		return;
+	}
+
 	gi.WriteByte (svc_temp_entity);
 	gi.WriteByte (TE_SPLASH);
 	gi.WriteByte (self->count);
@@ -369,6 +454,11 @@ void use_target_splash (edict_t *self, edict_t *other, edict_t *activator)
 
 void SP_target_splash (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->use = use_target_splash;
 	G_SetMovedir (self->s.angles, self->movedir);
 
@@ -397,6 +487,11 @@ void ED_CallSpawn (edict_t *ent);
 
 void use_target_spawner (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	edict_t	*ent;
 
 	ent = G_Spawn();
@@ -414,6 +509,11 @@ void use_target_spawner (edict_t *self, edict_t *other, edict_t *activator)
 
 void SP_target_spawner (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->use = use_target_spawner;
 	self->svflags = SVF_NOCLIENT;
 	if (self->speed)
@@ -436,6 +536,11 @@ void use_target_blaster (edict_t *self, edict_t *other, edict_t *activator)
 {
 	int effect;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if(EMPNukeCheck(self, self->s.origin))
 	{
 		gi.sound (self, CHAN_AUTO, gi.soundindex("items/empnuke/emp_missfire.wav"), 1, ATTN_NORM, 0);
@@ -455,6 +560,11 @@ void use_target_blaster (edict_t *self, edict_t *other, edict_t *activator)
 
 void SP_target_blaster (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->use = use_target_blaster;
 	G_SetMovedir (self->s.angles, self->movedir);
 	self->noise_index = gi.soundindex ("weapons/laser2.wav");
@@ -475,12 +585,22 @@ Once this trigger is touched/used, any trigger_crosslevel_target with the same t
 */
 void trigger_crosslevel_trigger_use (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	game.serverflags |= self->spawnflags;
 	G_FreeEdict (self);
 }
 
 void SP_target_crosslevel_trigger (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->svflags = SVF_NOCLIENT;
 	self->use = trigger_crosslevel_trigger_use;
 }
@@ -493,6 +613,11 @@ killtarget also work.
 */
 void target_crosslevel_target_think (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->spawnflags == (game.serverflags & SFL_CROSS_TRIGGER_MASK & self->spawnflags))
 	{
 		G_UseTargets (self, self);
@@ -502,7 +627,12 @@ void target_crosslevel_target_think (edict_t *self)
 
 void SP_target_crosslevel_target (edict_t *self)
 {
-	if (! self->delay)
+	if (!self)
+	{
+		return;
+	}
+
+	if (!self->delay)
 		self->delay = 1;
 	self->svflags = SVF_NOCLIENT;
 
@@ -527,6 +657,11 @@ void target_laser_think (edict_t *self)
 	vec3_t	last_movedir;
 	int		count;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->spawnflags & 0x80000000)
 		count = 8;
 	else
@@ -584,6 +719,11 @@ void target_laser_think (edict_t *self)
 
 void target_laser_on (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!self->activator)
 		self->activator = self;
 	self->spawnflags |= 0x80000001;
@@ -593,6 +733,11 @@ void target_laser_on (edict_t *self)
 
 void target_laser_off (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->spawnflags &= ~1;
 	self->svflags |= SVF_NOCLIENT;
 	self->nextthink = 0;
@@ -600,6 +745,11 @@ void target_laser_off (edict_t *self)
 
 void target_laser_use (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self || !activator)
+	{
+		return;
+	}
+
 	self->activator = activator;
 	if (self->spawnflags & 1)
 		target_laser_off (self);
@@ -611,6 +761,11 @@ void target_laser_start (edict_t *self)
 {
 	edict_t *ent;
 
+	if (!self)
+	{
+		return;
+	}
+
 	self->movetype = MOVETYPE_NONE;
 	self->solid = SOLID_NOT;
 	self->s.renderfx |= RF_BEAM|RF_TRANSLUCENT;
@@ -666,6 +821,11 @@ void target_laser_start (edict_t *self)
 
 void SP_target_laser (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	// let everything else get spawned before we start firing
 	self->think = target_laser_start;
 	self->nextthink = level.time + 1;
@@ -682,6 +842,11 @@ void target_lightramp_think (edict_t *self)
 {
 	char	style[2];
 
+	if (!self)
+	{
+		return;
+	}
+
 	style[0] = 'a' + self->movedir[0] + (level.time - self->timestamp) / FRAMETIME * self->movedir[2];
 	style[1] = 0;
 	gi.configstring (CS_LIGHTS+self->enemy->style, style);
@@ -703,6 +868,11 @@ void target_lightramp_think (edict_t *self)
 
 void target_lightramp_use (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!self->enemy)
 	{
 		edict_t		*e;
@@ -739,6 +909,11 @@ void target_lightramp_use (edict_t *self, edict_t *other, edict_t *activator)
 
 void SP_target_lightramp (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!self->message || strlen(self->message) != 2 || self->message[0] < 'a' || self->message[0] > 'z' || self->message[1] < 'a' || self->message[1] > 'z' || self->message[0] == self->message[1])
 	{
 		gi.dprintf("target_lightramp has bad ramp (%s) at %s\n", self->message, vtos(self->s.origin));
@@ -782,6 +957,11 @@ void target_earthquake_think (edict_t *self)
 	int		i;
 	edict_t	*e;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->last_move_time < level.time)
 	{
 		gi.positioned_sound (self->s.origin, self, CHAN_AUTO, self->noise_index, 1.0, ATTN_NONE, 0);
@@ -809,6 +989,11 @@ void target_earthquake_think (edict_t *self)
 
 void target_earthquake_use (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self || !activator)
+	{
+		return;
+	}
+
 	self->timestamp = level.time + self->count;
 	self->nextthink = level.time + FRAMETIME;
 	self->activator = activator;
@@ -817,6 +1002,11 @@ void target_earthquake_use (edict_t *self, edict_t *other, edict_t *activator)
 
 void SP_target_earthquake (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!self->targetname)
 		gi.dprintf("untargeted %s at %s\n", self->classname, vtos(self->s.origin));
 

src/g_trigger.c

@@ -3,6 +3,11 @@
 
 void InitTrigger (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!VectorCompare (self->s.angles, vec3_origin))
 		G_SetMovedir (self->s.angles, self->movedir);
 
@@ -16,6 +21,11 @@ void InitTrigger (edict_t *self)
 // the wait time has passed, so set back up for another activation
 void multi_wait (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->nextthink = 0;
 }
 
@@ -25,6 +35,11 @@ void multi_wait (edict_t *ent)
 // so wait for the delay time before firing
 void multi_trigger (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->nextthink)
 		return;		// already been triggered
 
@@ -36,7 +51,8 @@ void multi_trigger (edict_t *ent)
 		ent->nextthink = level.time + ent->wait;
 	}
 	else
-	{	// we can't just remove (self) here, because this is a touch function
+	{	
+		// we can't just remove (self) here, because this is a touch function
 		// called while looping through area links...
 		ent->touch = NULL;
 		ent->nextthink = level.time + FRAMETIME;
@@ -46,12 +62,22 @@ void multi_trigger (edict_t *ent)
 
 void Use_Multi (edict_t *ent, edict_t *other, edict_t *activator)
 {
+	if (!ent || !activator)
+	{
+		return;
+	}
+
 	ent->activator = activator;
 	multi_trigger (ent);
 }
 
 void Touch_Multi (edict_t *self, edict_t *other, cplane_t *plane, csurface_t *surf)
 {
+	if (!self || !other)
+	{
+		return;
+	}
+
 	if(other->client)
 	{
 		if (self->spawnflags & 2)
@@ -91,6 +117,11 @@ set "message" to text string
 */
 void trigger_enable (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->solid = SOLID_TRIGGER;
 	self->use = Use_Multi;
 	gi.linkentity (self);
@@ -98,6 +129,11 @@ void trigger_enable (edict_t *self, edict_t *other, edict_t *activator)
 
 void SP_trigger_multiple (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->sounds == 1)
 		ent->noise_index = gi.soundindex ("misc/secret.wav");
 	else if (ent->sounds == 2)
@@ -148,6 +184,11 @@ sounds
 
 void SP_trigger_once(edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	// make old maps work because I messed up on flag assignments here
 	// triggered was on bit 1 when it should have been on bit 4
 	if (ent->spawnflags & 1)
@@ -169,11 +210,21 @@ This fixed size trigger cannot be touched, it can only be fired by other events.
 */
 void trigger_relay_use (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self || !activator)
+	{
+		return;
+	}
+
 	G_UseTargets (self, activator);
 }
 
 void SP_trigger_relay (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->use = trigger_relay_use;
 }
 
@@ -194,6 +245,11 @@ void trigger_key_use (edict_t *self, edict_t *other, edict_t *activator)
 {
 	int			index;
 
+	if (!self || !activator)
+	{
+		return;
+	}
+
 	if (!self->item)
 		return;
 	if (!activator->client)
@@ -262,6 +318,11 @@ void trigger_key_use (edict_t *self, edict_t *other, edict_t *activator)
 
 void SP_trigger_key (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!st.item)
 	{
 		gi.dprintf("no key item for trigger_key at %s\n", vtos(self->s.origin));
@@ -306,6 +367,11 @@ After the counter has been triggered "count" times (default 2), it will fire all
 
 void trigger_counter_use(edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self || !activator)
+	{
+		return;
+	}
+
 	if (self->count == 0)
 		return;
 
@@ -332,6 +398,11 @@ void trigger_counter_use(edict_t *self, edict_t *other, edict_t *activator)
 
 void SP_trigger_counter (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->wait = -1;
 	if (!self->count)
 		self->count = 2;
@@ -353,6 +424,11 @@ This trigger will always fire.  It is activated by the world.
 */
 void SP_trigger_always (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	// we must have some delay to make sure our use targets are present
 	if (ent->delay < 0.2)
 		ent->delay = 0.2;
@@ -376,6 +452,11 @@ static int windsound;  // fixup or zaero or may not work with mirror level's...
 
 void trigger_push_touch (edict_t *self, edict_t *other, cplane_t *plane, csurface_t *surf)
 {
+	if (!self || !other)
+	{
+		return;
+	}
+
 	if (self->spawnflags & START_OFF)
 	{
 		if (self->message && self->touch_debounce_time < level.time)
@@ -412,6 +493,11 @@ void trigger_push_touch (edict_t *self, edict_t *other, cplane_t *plane, csurfac
 
 void trigger_push_use(edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->spawnflags & START_OFF)
 		self->spawnflags &= ~START_OFF;
 	else
@@ -424,6 +510,11 @@ Pushes the player
 */
 void SP_trigger_push (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	InitTrigger (self);
 	windsound = gi.soundindex ("misc/windfly.wav");
 	self->touch = trigger_push_touch;
@@ -459,6 +550,11 @@ NO_PROTECTION	*nothing* stops the damage
 */
 void hurt_use (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->solid == SOLID_NOT)
 		self->solid = SOLID_TRIGGER;
 	else
@@ -474,6 +570,11 @@ void hurt_touch (edict_t *self, edict_t *other, cplane_t *plane, csurface_t *sur
 {
 	int		dflags;
 
+	if (!self || !other)
+	{
+		return;
+	}
+
 	if (!other->takedamage)
 		return;
 
@@ -500,6 +601,11 @@ void hurt_touch (edict_t *self, edict_t *other, cplane_t *plane, csurface_t *sur
 
 void SP_trigger_hurt (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	InitTrigger (self);
 
 	self->noise_index = gi.soundindex ("world/electro.wav");
@@ -536,11 +642,21 @@ gravity for the level.
 
 void trigger_gravity_touch (edict_t *self, edict_t *other, cplane_t *plane, csurface_t *surf)
 {
+	if (!self || !other)
+	{
+		return;
+	}
+
 	other->gravity = self->gravity;
 }
 
 void SP_trigger_gravity (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (st.gravity == 0)
 	{
 		gi.dprintf("trigger_gravity without gravity set at %s\n", vtos(self->s.origin));
@@ -570,6 +686,11 @@ Walking monsters that touch this will jump in the direction of the trigger's ang
 
 void trigger_monsterjump_touch (edict_t *self, edict_t *other, cplane_t *plane, csurface_t *surf)
 {
+	if (!self || !other)
+	{
+		return;
+	}
+
 	if (other->flags & (FL_FLY | FL_SWIM) )
 		return;
 	if (other->svflags & SVF_DEADMONSTER)
@@ -590,6 +711,11 @@ void trigger_monsterjump_touch (edict_t *self, edict_t *other, cplane_t *plane,
 
 void SP_trigger_monsterjump (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!self->speed)
 		self->speed = 200;
 	if (!st.height)

src/g_turret.c

@@ -30,6 +30,11 @@ void turret_blocked(edict_t *self, edict_t *other)
 {
 	edict_t	*attacker;
 
+	if (!self || !other)
+	{
+		return;
+	}
+
 	if (other->takedamage)
 	{
 		if (self->teammaster->owner)
@@ -63,6 +68,11 @@ void turret_breach_fire (edict_t *self)
 	int		damage;
 	int		speed;
 
+	if (!self)
+	{
+		return;
+	}
+
 	AngleVectors (self->s.angles, f, r, u);
 	VectorMA (self->s.origin, self->move_origin[0], f, start);
 	VectorMA (start, self->move_origin[1], r, start);
@@ -86,6 +96,11 @@ void turret_breach_think (edict_t *self)
 	vec3_t	current_angles;
 	vec3_t	delta;
 
+	if (!self)
+	{
+		return;
+	}
+
 	VectorCopy (self->s.angles, current_angles);
 	AnglesNormalize(current_angles);
 
@@ -187,6 +202,11 @@ void turret_breach_think (edict_t *self)
 
 void turret_breach_finish_init (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	// get and save info for muzzle location
 	if (!self->target)
 	{
@@ -206,6 +226,11 @@ void turret_breach_finish_init (edict_t *self)
 
 void SP_turret_breach (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->solid = SOLID_BSP;
 	self->movetype = MOVETYPE_PUSH;
 	gi.setmodel (self, self->model);
@@ -245,6 +270,11 @@ MUST be teamed with a turret_breach.
 
 void SP_turret_base (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->solid = SOLID_BSP;
 	self->movetype = MOVETYPE_PUSH;
 	gi.setmodel (self, self->model);
@@ -266,6 +296,11 @@ void turret_driver_die (edict_t *self, edict_t *inflictor, edict_t *attacker, in
 {
 	edict_t	*ent;
 
+	if (!self || !inflictor || !attacker)
+	{
+		return;
+	}
+
 	// level the gun
 	self->target_ent->move_angles[0] = 0;
 
@@ -290,6 +325,11 @@ void turret_driver_think (edict_t *self)
 	vec3_t	dir;
 	float	reaction_time;
 
+	if (!self)
+	{
+		return;
+	}
+
 	self->nextthink = level.time + FRAMETIME;
 
 	if (self->enemy && (!self->enemy->inuse || self->enemy->health <= 0))
@@ -343,6 +383,11 @@ void turret_driver_link (edict_t *self)
 	vec3_t	vec;
 	edict_t	*ent;
 
+	if (!self)
+	{
+		return;
+	}
+
 	self->think = turret_driver_think;
 	self->nextthink = level.time + FRAMETIME;
 
@@ -373,6 +418,11 @@ void turret_driver_link (edict_t *self)
 
 void SP_turret_driver (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);

src/g_utils.c

@@ -27,6 +27,11 @@ edict_t *G_Find (edict_t *from, int fieldofs, char *match)
 {
 	char	*s;
 
+	if (!from)
+	{
+		return NULL;
+	}
+
 	if (!from)
 		from = g_edicts;
 	else
@@ -61,6 +66,11 @@ edict_t *findradius (edict_t *from, vec3_t org, float rad)
 	vec3_t	eorg;
 	int		j;
 
+	if (!from)
+	{
+		return NULL;
+	}
+
 	if (!from)
 		from = g_edicts;
 	else
@@ -131,6 +141,11 @@ edict_t *G_PickTarget (char *targetname)
 
 void Think_Delay (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	G_UseTargets (ent, ent->activator);
 	G_FreeEdict (ent);
 }
@@ -155,6 +170,11 @@ void G_UseTargets (edict_t *ent, edict_t *activator)
 {
 	edict_t		*t;
 
+	if (!ent || !activator)
+	{
+		return;
+	}
+
 	//
 	// check for a delay
 	//
@@ -381,6 +401,11 @@ char *G_CopyString (char *in)
 
 void G_InitEdict (edict_t *e)
 {
+	if (!e)
+	{
+		return;
+	}
+
 	e->inuse = true;
 	e->classname = "noclass";
 	e->gravity = 1.0;
@@ -432,6 +457,11 @@ Marks the edict as free
 */
 void G_FreeEdict (edict_t *ed)
 {
+	if (!ed)
+	{
+		return;
+	}
+
 	gi.unlinkentity (ed);		// unlink from world
 
 	if ((ed - g_edicts) <= (maxclients->value + BODY_QUEUE_SIZE))
@@ -458,6 +488,11 @@ void	G_TouchTriggers (edict_t *ent)
 	int			i, num;
 	edict_t		*touch[MAX_EDICTS], *hit;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	// dead things don't activate triggers!
 	if ((ent->client || (ent->svflags & SVF_MONSTER)) && (ent->health <= 0))
 		return;
@@ -491,6 +526,11 @@ void	G_TouchSolids (edict_t *ent)
 	int			i, num;
 	edict_t		*touch[MAX_EDICTS], *hit;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	num = gi.BoxEdicts (ent->absmin, ent->absmax, touch
 		, MAX_EDICTS, AREA_SOLID);
 
@@ -528,6 +568,11 @@ qboolean KillBox (edict_t *ent)
 {
 	trace_t		tr;
 
+	if (!ent)
+	{
+		return false;
+	}
+
 	while (1)
 	{
 		tr = gi.trace (ent->s.origin, ent->mins, ent->maxs, ent->s.origin, NULL, MASK_PLAYERSOLID);
@@ -557,6 +602,11 @@ qboolean MonsterKillBox (edict_t *ent)
 {
 	trace_t		tr;
 
+	if (!ent)
+	{
+		return false;
+	}
+
 	while (1)
 	{
 		tr = gi.trace (ent->s.origin, ent->mins, ent->maxs, ent->s.origin, NULL, MASK_PLAYERSOLID);
@@ -589,6 +639,11 @@ qboolean MonsterPlayerKillBox (edict_t *ent)
 {
 	trace_t		tr;
 
+	if (!ent)
+	{
+		return false;
+	}
+
 	while (1)
 	{
 		tr = gi.trace (ent->s.origin, ent->mins, ent->maxs, ent->s.origin, ent, MASK_PLAYERSOLID);

src/g_weapon.c

@@ -17,6 +17,11 @@ void check_dodge (edict_t *self, vec3_t start, vec3_t dir, int speed)
 	trace_t	tr;
 	float	eta;
 
+	if (!self)
+	{
+		return;
+	}
+
 	// easy mode only ducks one quarter the time
 	if (skill->value == SKILL_EASY)
 	{
@@ -81,6 +86,11 @@ qboolean fire_hit (edict_t *self, vec3_t aim, int damage, int kick)
 	float		range;
 	vec3_t		dir;
 
+	if (!self)
+	{
+		return false;
+	}
+
 	//see if enemy is in range
 	VectorSubtract (self->enemy->s.origin, self->s.origin, dir);
 	range = VectorLength(dir);
@@ -155,6 +165,11 @@ void fire_lead (edict_t *self, vec3_t start, vec3_t aimdir, int damage, int kick
 	qboolean	water = false;
 	int			content_mask = MASK_SHOT | MASK_WATER;
 
+	if (!self)
+	{
+		return;
+	}
+
 	tr = gi.trace (self->s.origin, NULL, NULL, start, self, MASK_SHOT);
 	if (!(tr.fraction < 1.0))
 	{
@@ -288,6 +303,11 @@ pistols, rifles, etc....
 */
 void fire_bullet (edict_t *self, vec3_t start, vec3_t aimdir, int damage, int kick, int hspread, int vspread, int mod)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	fire_lead (self, start, aimdir, damage, kick, TE_GUNSHOT, hspread, vspread, mod);
 }
 
@@ -303,6 +323,11 @@ void fire_shotgun (edict_t *self, vec3_t start, vec3_t aimdir, int damage, int k
 {
 	int		i;
 
+	if (!self)
+	{
+		return;
+	}
+
 	for (i = 0; i < count; i++)
 		fire_lead (self, start, aimdir, damage, kick, TE_SHOTGUN, hspread, vspread, mod);
 }
@@ -319,6 +344,11 @@ void blaster_touch (edict_t *self, edict_t *other, cplane_t *plane, csurface_t *
 {
 	int		mod;
 
+	if (!self || !other)
+	{
+		return;
+	}
+
 	if (other == self->owner)
 		return;
 
@@ -359,6 +389,11 @@ void fire_blaster (edict_t *self, vec3_t start, vec3_t dir, int damage, int spee
 	edict_t	*bolt;
 	trace_t	tr;
 
+	if (!self)
+	{
+		return;
+	}
+
 	VectorNormalize (dir);
 
 	bolt = G_Spawn();
@@ -404,6 +439,11 @@ void Grenade_Explode (edict_t *ent)
 	vec3_t		origin;
 	int			mod;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->owner->client)
 		PlayerNoise(ent->owner, ent->s.origin, PNOISE_IMPACT);
 
@@ -458,6 +498,11 @@ void Grenade_Explode (edict_t *ent)
 
 void Grenade_Touch (edict_t *ent, edict_t *other, cplane_t *plane, csurface_t *surf)
 {
+	if (!ent || !other)
+	{
+		return;
+	}
+
 	if (other == ent->owner)
 		return;
 
@@ -493,6 +538,11 @@ void fire_grenade (edict_t *self, vec3_t start, vec3_t aimdir, int damage, int s
 	vec3_t	dir;
 	vec3_t	forward, right, up;
 
+	if (!self)
+	{
+		return;
+	}
+
 	vectoangles (aimdir, dir);
 	AngleVectors (dir, forward, right, up);
 
@@ -526,6 +576,11 @@ void fire_grenade2 (edict_t *self, vec3_t start, vec3_t aimdir, int damage, int
 	vec3_t	dir;
 	vec3_t	forward, right, up;
 
+	if (!self)
+	{
+		return;
+	}
+
 	vectoangles (aimdir, dir);
 	AngleVectors (dir, forward, right, up);
 
@@ -575,6 +630,11 @@ void rocket_touch (edict_t *ent, edict_t *other, cplane_t *plane, csurface_t *su
 	vec3_t		origin;
 	int			n;
 
+	if (!ent || !other)
+	{
+		return;
+	}
+
 	if (other == ent->owner)
 		return;
 
@@ -625,6 +685,11 @@ void fire_rocket (edict_t *self, vec3_t start, vec3_t dir, int damage, int speed
 {
 	edict_t	*rocket;
 
+	if (!self)
+	{
+		return;
+	}
+
 	rocket = G_Spawn();
 	VectorCopy (start, rocket->s.origin);
 	VectorCopy (dir, rocket->movedir);
@@ -668,6 +733,11 @@ void fire_rail (edict_t *self, vec3_t start, vec3_t aimdir, int damage, int kick
 	int			mask;
 	qboolean	water;
 
+	if (!self)
+	{
+		return;
+	}
+
 	VectorMA (start, 8192, aimdir, end);
 	VectorCopy (start, from);
 	ignore = self;
@@ -728,6 +798,11 @@ void bfg_explode (edict_t *self)
 	vec3_t	v;
 	float	dist;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->s.frame == 0)
 	{
 		// the BFG effect
@@ -769,6 +844,11 @@ void bfg_explode (edict_t *self)
 
 void bfg_touch (edict_t *self, edict_t *other, cplane_t *plane, csurface_t *surf)
 {
+	if (!self || !other)
+	{
+		return;
+	}
+
 	if (other == self->owner)
 		return;
 
@@ -817,6 +897,11 @@ void bfg_think (edict_t *self)
 	int		dmg;
 	trace_t	tr;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 		dmg = 5;
 	else
@@ -888,6 +973,11 @@ void fire_bfg (edict_t *self, vec3_t start, vec3_t dir, int damage, int speed, f
 {
 	edict_t	*bfg;
 
+	if (!self)
+	{
+		return;
+	}
+
 	bfg = G_Spawn();
 	VectorCopy (start, bfg->s.origin);
 	VectorCopy (dir, bfg->movedir);

src/monster/actor/actor.c

@@ -67,6 +67,11 @@ mmove_t actor_move_stand = {FRAME_stand101, FRAME_stand140, actor_frames_stand,
 
 void actor_stand (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &actor_move_stand;
 
 	// randomize on startup
@@ -93,6 +98,11 @@ mmove_t actor_move_walk = {FRAME_walk01, FRAME_walk08, actor_frames_walk, NULL};
 
 void actor_walk (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &actor_move_walk;
 }
 
@@ -116,6 +126,11 @@ mmove_t actor_move_run = {FRAME_run02, FRAME_run07, actor_frames_run, NULL};
 
 void actor_run (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if ((level.time < self->pain_debounce_time) && (!self->enemy))
 	{
 		if (self->movetarget)
@@ -212,6 +227,11 @@ void actor_pain (edict_t *self, edict_t *other, float kick, int damage)
 {
 	int		n;
 
+	if (!self || !other)
+	{
+		return;
+	}
+
 	if (self->health < (self->max_health / 2))
 		self->s.skinnum = 1;
 
@@ -251,6 +271,11 @@ void actorMachineGun (edict_t *self)
 	vec3_t	start, target;
 	vec3_t	forward, right;
 
+	if (!self)
+	{
+		return;
+	}
+
 	AngleVectors (self->s.angles, forward, right, NULL);
 	G_ProjectSource (self->s.origin, monster_flash_offset[MZ2_ACTOR_MACHINEGUN_1], forward, right, start);
 	if (self->enemy)
@@ -278,6 +303,11 @@ void actorMachineGun (edict_t *self)
 
 void actor_dead (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (self->mins, -16, -16, -24);
 	VectorSet (self->maxs, 16, 16, -8);
 	self->movetype = MOVETYPE_TOSS;
@@ -320,6 +350,11 @@ void actor_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damage
 {
 	int		n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	// check for gib
 	if (self->health <= -80)
 	{
@@ -349,6 +384,11 @@ void actor_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damage
 
 void actor_fire (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	actorMachineGun (self);
 
 	if (level.time >= self->monsterinfo.pausetime)
@@ -370,6 +410,11 @@ void actor_attack(edict_t *self)
 {
 	int		n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &actor_move_attack;
 	n = (rand() & 15) + 3 + 7;
 	self->monsterinfo.pausetime = level.time + n * FRAMETIME;
@@ -380,6 +425,11 @@ void actor_use (edict_t *self, edict_t *other, edict_t *activator)
 {
 	vec3_t		v;
 
+	if (!self)
+	{
+		return;
+	}
+
 	self->goalentity = self->movetarget = G_PickTarget(self->target);
 	if ((!self->movetarget) || (strcmp(self->movetarget->classname, "target_actor") != 0))
 	{
@@ -402,6 +452,11 @@ void actor_use (edict_t *self, edict_t *other, edict_t *activator)
 
 void SP_misc_actor (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);
@@ -475,6 +530,11 @@ void target_actor_touch (edict_t *self, edict_t *other, cplane_t *plane, csurfac
 {
 	vec3_t	v;
 
+	if (!self || !other)
+	{
+		return;
+	}
+
 	if (other->movetarget != self)
 		return;
 
@@ -562,6 +622,11 @@ void target_actor_touch (edict_t *self, edict_t *other, cplane_t *plane, csurfac
 
 void SP_target_actor (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!self->targetname)
 		gi.dprintf ("%s with no targetname at %s\n", self->classname, vtos(self->s.origin));
 

src/monster/berserker/berserker.c

@@ -19,11 +19,21 @@ static int sound_search;
 
 void berserk_sight (edict_t *self, edict_t *other)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_sight, 1, ATTN_NORM, 0);
 }
 
 void berserk_search (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_search, 1, ATTN_NORM, 0);
 }
 
@@ -41,6 +51,11 @@ mmove_t berserk_move_stand = {FRAME_stand1, FRAME_stand5, berserk_frames_stand,
 
 void berserk_stand (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &berserk_move_stand;
 }
 
@@ -71,6 +86,11 @@ mmove_t berserk_move_stand_fidget = {FRAME_standb1, FRAME_standb20, berserk_fram
 
 void berserk_fidget (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
 		return;
 	if (random() > 0.15)
@@ -100,6 +120,11 @@ mmove_t berserk_move_walk = {FRAME_walkc1, FRAME_walkc11, berserk_frames_walk, N
 
 void berserk_walk (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &berserk_move_walk;
 }
 
@@ -116,6 +141,11 @@ mmove_t berserk_move_run1 = {FRAME_run1, FRAME_run6, berserk_frames_run1, NULL};
 
 void berserk_run (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
 		self->monsterinfo.currentmove = &berserk_move_stand;
 	else
@@ -125,6 +155,11 @@ void berserk_run (edict_t *self)
 
 void berserk_attack_spike (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	static	vec3_t	aim = {MELEE_DISTANCE, 0, -24};
 	fire_hit (self, aim, (15 + (rand() % 6)), 400);		//	Faster attack -- upwards and backwards
 }
@@ -132,6 +167,11 @@ void berserk_attack_spike (edict_t *self)
 
 void berserk_swing (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_WEAPON, sound_punch, 1, ATTN_NORM, 0);
 }
 
@@ -153,6 +193,11 @@ void berserk_attack_club (edict_t *self)
 {
 	vec3_t	aim;
 
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (aim, MELEE_DISTANCE, self->mins[0], -4);
 	fire_hit (self, aim, (5 + (rand() % 6)), 400);		// Slower attack
 }
@@ -203,6 +248,11 @@ mmove_t berserk_move_attack_strike = {FRAME_att_c21, FRAME_att_c34, berserk_fram
 
 void berserk_melee (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if ((rand() % 2) == 0)
 		self->monsterinfo.currentmove = &berserk_move_attack_spike;
 	else
@@ -246,6 +296,11 @@ mmove_t berserk_move_pain2 = {FRAME_painb1, FRAME_painb20, berserk_frames_pain2,
 
 void berserk_pain (edict_t *self, edict_t *other, float kick, int damage)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->health < (self->max_health / 2))
 		self->s.skinnum = 1;
 
@@ -267,6 +322,11 @@ void berserk_pain (edict_t *self, edict_t *other, float kick, int damage)
 
 void berserk_dead (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (self->mins, -16, -16, -24);
 	VectorSet (self->maxs, 16, 16, -8);
 	self->movetype = MOVETYPE_TOSS;
@@ -314,6 +374,11 @@ void berserk_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int dama
 {
 	int		n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->health <= self->gib_health)
 	{
 		gi.sound (self, CHAN_VOICE, gi.soundindex ("misc/udeath.wav"), 1, ATTN_NORM, 0);
@@ -344,6 +409,11 @@ void berserk_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int dama
 */
 void SP_monster_berserk (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);

src/monster/boss/boss.c

@@ -45,18 +45,33 @@ void zboss_attack (edict_t *self);
 
 void zboss_walksound (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_BODY, sound_walk, 1, ATTN_NORM, 0);
 }
 
 
 void zboss_sight (edict_t *self, edict_t *other)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_sight, 1, ATTN_NORM, 0);
 }
 
 
 void possibleBossTaunt(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	float r = random();
 
 	if(random() < 0.10)
@@ -155,6 +170,11 @@ mmove_t zboss_stand2 = {FRAME_stand2start, FRAME_stand2end, zboss_frames_stand2,
 
 void zboss_standidle (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (random() < 0.8)
   {
 		gi.sound (self, CHAN_VOICE, sound_idle1, 1, ATTN_NORM, 0);
@@ -187,6 +207,11 @@ mmove_t zboss_move_postwalk = {FRAME_postWalkStart, FRAME_postWalkEnd, zboss_fra
 
 void zboss_postWalkRun (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &zboss_move_postwalk;
 }
 
@@ -229,11 +254,21 @@ mmove_t zboss_move_walk = {FRAME_walkStart, FRAME_walkEnd, zboss_frames_walk, zb
 
 void zboss_walk (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &zboss_move_prewalk;
 }
 
 void zboss_walk2(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &zboss_move_walk;
 }
 
@@ -276,6 +311,11 @@ mmove_t zboss_move_run = {FRAME_walkStart, FRAME_walkEnd, zboss_frames_run, NULL
 
 void zboss_run (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
     zboss_stand(self);
 	else
@@ -284,6 +324,11 @@ void zboss_run (edict_t *self)
 
 void zboss_run2 (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
     zboss_stand(self);
 	else
@@ -295,6 +340,11 @@ void zboss_run2 (edict_t *self)
 //
 void zboss_stand (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if(self->monsterinfo.currentmove == &zboss_move_prewalk || 
 				self->monsterinfo.currentmove == &zboss_move_walk || 
 				self->monsterinfo.currentmove == &zboss_move_prerun || 
@@ -367,6 +417,11 @@ void zboss_pain (edict_t *self, edict_t *other, float kick, int damage)
 	float r;
 	float hbreak = (self->max_health / 3.0);
 
+	if (!self)
+	{
+		return;
+	}
+
 	// set the skin
 	if (self->health < hbreak)
 	{
@@ -469,6 +524,11 @@ void zboss_pain (edict_t *self, edict_t *other, float kick, int damage)
 
 void zboss_swing (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	static	vec3_t	aim = {MELEE_DISTANCE, 0, -24};
 	fire_hit (self, aim, (15 + (rand() % 6)), 800);
 }
@@ -489,6 +549,11 @@ mmove_t zboss_move_attack2c = {FRAME_attack2cStart, FRAME_attack2cEnd, zboss_fra
 
 void zboss_melee2 (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &zboss_move_attack2c;
 	gi.sound (self, CHAN_WEAPON, sound_swing, 1, ATTN_NORM, 0);
 }
@@ -510,6 +575,11 @@ mmove_t zboss_move_premelee = {FRAME_preHookStart, FRAME_preHookEnd, zboss_frame
 
 void zboss_melee (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_BODY, sound_raisegun, 1, ATTN_NORM, 0);
 	self->monsterinfo.currentmove = &zboss_move_premelee;
 }
@@ -536,6 +606,11 @@ mmove_t zboss_move_attack1b = {FRAME_attack1bStart, FRAME_attack1bEnd, zboss_fra
 
 void zboss_reloadRockets(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.aiflags &= ~AI_ONESHOTTARGET;
 	self->monsterinfo.currentmove = &zboss_move_attack1b;
 }
@@ -559,6 +634,11 @@ void FireFlare(edict_t *self)
 	vec3_t	dir;
 	vec3_t	vec;
 
+	if (!self)
+	{
+		return;
+	}
+
 	int offset = (self->s.frame - 71) / 3;
 
 	AngleVectors (self->s.angles, forward, right, NULL);
@@ -595,6 +675,11 @@ void FireRocket(edict_t *self)
 	vec3_t	dir;
 	vec3_t	vec;
 
+	if (!self)
+	{
+		return;
+	}
+
 	int offset = (self->s.frame - 71) / 3;
 
 	AngleVectors (self->s.angles, forward, right, NULL);
@@ -661,6 +746,11 @@ void zboss_reelInGraaple2(edict_t *self)
 	vec3_t	hookoffset	= {-5, -24, 34};
 	vec3_t	forward, right;
 
+	if (!self)
+	{
+		return;
+	}
+
 	AngleVectors (self->s.angles, forward, right, NULL);
 	G_ProjectSource(self->s.origin, hookoffset, forward, right, vec);
 	VectorSubtract (vec, self->laser->s.origin, dir);
@@ -704,6 +794,11 @@ void HookDragThink (edict_t *self)
 	vec3_t	hookoffset	= {-5, -24, 34};
 	vec3_t	forward, right;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if(self->enemy && self->enemy->health > 0)
 	{
 		VectorCopy (self->enemy->s.origin, self->s.origin);
@@ -769,6 +864,11 @@ void HookThink(edict_t *self)
 	vec3_t	hookoffset	= {-3, -24, 34};
 	vec3_t	forward, right;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if(self->powerarmor_time < level.time)
 	{
 		self->powerarmor_time = level.time + 15;
@@ -802,6 +902,11 @@ void FireHook(edict_t *self)
 	edict_t	*hook;
 	float speed;
 
+	if (!self)
+	{
+		return;
+	}
+
 	AngleVectors (self->s.angles, forward, right, NULL);
 
 	G_ProjectSource (self->s.origin, hookoffset, forward, right, start);
@@ -843,6 +948,11 @@ void FireHook(edict_t *self)
 
 void zboss_reelInGraaple(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &zboss_move_attack2b;
 }
 
@@ -872,11 +982,21 @@ mmove_t zboss_move_posthook = {FRAME_postHookStart, FRAME_postHookEnd, zboss_fra
 
 void zboss_posthook(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &zboss_move_posthook;
 }
 
 void zboss_chooseHookRocket(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if(random() < 0.2 && !(self->monsterinfo.aiflags & AI_ONESHOTTARGET))
 	{
 		self->monsterinfo.currentmove = &zboss_move_attack2a;
@@ -909,6 +1029,11 @@ void PlasmaballBlastAnim(edict_t	*ent)
 	ent->s.frame++;
 	ent->s.skinnum++;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if(ent->s.frame > 1)
 	{
 		G_FreeEdict(ent);
@@ -922,6 +1047,11 @@ void PlasmaballBlastAnim(edict_t	*ent)
 
 void Plasmaball_Explode (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	//FIXME: if we are onground then raise our Z just a bit since we are a point?
 	if (ent->enemy)
 	{
@@ -956,6 +1086,11 @@ void Plasmaball_Explode (edict_t *ent)
 
 void Plasmaball_Touch (edict_t *ent, edict_t *other, cplane_t *plane, csurface_t *surf)
 {
+	if (!ent || !other)
+	{
+		return;
+	}
+
 	if (other == ent->owner)
 		return;
 
@@ -975,6 +1110,11 @@ void fire_plasmaCannon (edict_t *self, vec3_t start, vec3_t aimdir, int damage,
 	vec3_t	dir;
 	vec3_t	forward, right, up;
 
+	if (!self)
+	{
+		return;
+	}
+
 	vectoangles (aimdir, dir);
 	AngleVectors (dir, forward, right, up);
 
@@ -1024,6 +1164,11 @@ void FireCannon(edict_t *self)
 	vec3_t	vec;
 	float distance;
 
+	if (!self)
+	{
+		return;
+	}
+
 	int offset = (self->s.frame - 119) / 2;
 
 	AngleVectors (self->s.angles, forward, right, NULL);
@@ -1097,6 +1242,11 @@ mmove_t zboss_move_attack3 = {FRAME_attack3Start, FRAME_attack3End, zboss_frames
 
 void zboss_fireCannons(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &zboss_move_attack3;
 
 	self->seq = 0;
@@ -1123,6 +1273,11 @@ mmove_t zboss_move_postcannon = {FRAME_postCannonStart, FRAME_postCannonEnd, zbo
 
 void zboss_postcannon(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &zboss_move_postcannon;
 }
 
@@ -1153,6 +1308,11 @@ mmove_t zboss_move_c2h = {FRAME_attackC2HStart, FRAME_attackC2HEnd, zboss_frames
 
 void zboss_chooseNextAttack(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->enemy == NULL)
 		return;
 
@@ -1203,6 +1363,11 @@ void zboss_chooseNextAttack(edict_t *self)
 
 void zboss_attack (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->enemy == NULL)
 		return;
 
@@ -1226,6 +1391,11 @@ Death Stuff Starts
 
 void zboss_dead (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (self->mins, -32, -74, -30);
 	VectorSet (self->maxs, 32, 40, 12);
 	self->movetype = MOVETYPE_TOSS;
@@ -1265,6 +1435,11 @@ void FireDeadRocket1(edict_t *self)
 	vec3_t	start;
 	vec3_t	rocketoffset	= {-26, -26, 25};
 
+	if (!self)
+	{
+		return;
+	}
+
 	AngleVectors (self->s.angles, forward, right, NULL);
 
 	G_ProjectSource (self->s.origin, rocketoffset, forward, right, start);
@@ -1283,6 +1458,11 @@ void FireDeadRocket2(edict_t *self)
 	vec3_t	start;
 	vec3_t	rocketoffset	= {-16, -21, 20};
 
+	if (!self)
+	{
+		return;
+	}
+
 	AngleVectors (self->s.angles, forward, right, NULL);
 
 	G_ProjectSource (self->s.origin, rocketoffset, forward, right, start);
@@ -1302,6 +1482,11 @@ void FireDeadRocket3(edict_t *self)
 	vec3_t	start;
 	vec3_t	rocketoffset	= {-17, -20, 30};
 
+	if (!self)
+	{
+		return;
+	}
+
 	AngleVectors (self->s.angles, forward, right, up);
 
 	G_ProjectSource (self->s.origin, rocketoffset, forward, right, start);
@@ -1316,10 +1501,15 @@ void FireDeadRocket3(edict_t *self)
 
 void FireDeadRocket4(edict_t *self)
 {
+
 	vec3_t	forward, right, up;
 	vec3_t	start;
 	vec3_t	rocketoffset	= {-8, -16, 17};
 
+	if (!self)
+	{
+		return;
+	}
 	AngleVectors (self->s.angles, forward, right, up);
 
 	G_ProjectSource (self->s.origin, rocketoffset, forward, right, start);
@@ -1338,6 +1528,11 @@ void FireDeadRocket5(edict_t *self)
 	vec3_t	start;
 	vec3_t	rocketoffset	= {-10, -16, 30};
 
+	if (!self)
+	{
+		return;
+	}
+
 	AngleVectors (self->s.angles, forward, right, up);
 
 	G_ProjectSource (self->s.origin, rocketoffset, forward, right, start);
@@ -1357,6 +1552,11 @@ void FireDeadRocket6(edict_t *self)
 	vec3_t	start;
 	vec3_t	rocketoffset	= {0, -18, 25};
 
+	if (!self)
+	{
+		return;
+	}
+
 	AngleVectors (self->s.angles, forward, right, up);
 
 	G_ProjectSource (self->s.origin, rocketoffset, forward, right, start);
@@ -1377,6 +1577,11 @@ void FireDeadRocket7(edict_t *self)
 	vec3_t	start;
 	vec3_t	rocketoffset	= {17, -27, 30};
 
+	if (!self)
+	{
+		return;
+	}
+
 	AngleVectors (self->s.angles, forward, right, up);
 
 	G_ProjectSource (self->s.origin, rocketoffset, forward, right, start);
@@ -1397,6 +1602,11 @@ void FireDeadCannon1(edict_t *self)
 	vec3_t	start;
 	vec3_t	cannonoffset	= {9, -46, 33};
 
+	if (!self)
+	{
+		return;
+	}
+
 	AngleVectors (self->s.angles, forward, right, NULL);
 
 	G_ProjectSource (self->s.origin, cannonoffset, forward, right, start);
@@ -1415,6 +1625,11 @@ void FireDeadCannon2(edict_t *self)
 	vec3_t	start;
 	vec3_t	cannonoffset	= {3, -31, 37};
 
+	if (!self)
+	{
+		return;
+	}
+
 	AngleVectors (self->s.angles, forward, right, NULL);
 
 	G_ProjectSource (self->s.origin, cannonoffset, forward, right, start);
@@ -1433,6 +1648,11 @@ void FireDeadCannon3(edict_t *self)
 	vec3_t	start;
 	vec3_t	cannonoffset	= {-21, -19, 24};
 
+	if (!self)
+	{
+		return;
+	}
+
 	AngleVectors (self->s.angles, forward, right, NULL);
 
 	G_ProjectSource (self->s.origin, cannonoffset, forward, right, start);
@@ -1447,6 +1667,11 @@ void FireDeadCannon3(edict_t *self)
 
 void DeadHookTouch (edict_t *ent, edict_t *other, cplane_t *plane, csurface_t *surf)
 {
+	if (!ent || !other)
+	{
+		return;
+	}
+
 	if (other == ent->owner)
 		return;
 
@@ -1467,6 +1692,11 @@ void FireDeadGrapple(edict_t *self)
 	edict_t	*hook;
 	float speed;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if(self->s.modelindex3 == 0)  // hook already out...
 		return;
 
@@ -1560,6 +1790,11 @@ void zboss_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damage
 {
 	int		n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if(self->laser)
 	{
 		G_FreeEdict(self->laser);
@@ -1636,6 +1871,11 @@ void SP_monster_zboss_precache(void)
 */
 void SP_monster_zboss (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);
@@ -1703,6 +1943,11 @@ void SP_monster_zboss (edict_t *self)
 
 void trigger_zboss (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	edict_t	*boss = NULL;
 
 	while ((boss = G_Find (boss, FOFS(targetname), self->target)) != NULL)
@@ -1718,6 +1963,11 @@ void trigger_zboss (edict_t *self, edict_t *other, edict_t *activator)
 
 void SP_target_zboss_target(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if(!self->target)
 	{
 		gi.dprintf("target_zboss_target does not have a target");

src/monster/boss2/boss2.c

@@ -21,6 +21,11 @@ static int	sound_search1;
 
 void boss2_search (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (random() < 0.5)
 		gi.sound (self, CHAN_VOICE, sound_search1, 1, ATTN_NONE, 0);
 }
@@ -40,6 +45,11 @@ void Boss2Rocket (edict_t *self)
 	vec3_t	dir;
 	vec3_t	vec;
 
+	if (!self)
+	{
+		return;
+	}
+
 	AngleVectors (self->s.angles, forward, right, NULL);
 
 	G_ProjectSource (self->s.origin, monster_flash_offset[MZ2_BOSS2_ROCKET_1], forward, right, start);
@@ -76,6 +86,11 @@ void boss2_firebullet_right (edict_t *self)
 	vec3_t	forward, right, target;
 	vec3_t	start;
 
+	if (!self)
+	{
+		return;
+	}
+
 	AngleVectors (self->s.angles, forward, right, NULL);
 	G_ProjectSource (self->s.origin, monster_flash_offset[MZ2_BOSS2_MACHINEGUN_R1], forward, right, start);
 
@@ -98,6 +113,11 @@ void boss2_firebullet_left (edict_t *self)
 	vec3_t	forward, right, target;
 	vec3_t	start;
 
+	if (!self)
+	{
+		return;
+	}
+
 	AngleVectors (self->s.angles, forward, right, NULL);
 	G_ProjectSource (self->s.origin, monster_flash_offset[MZ2_BOSS2_MACHINEGUN_L1], forward, right, start);
 
@@ -118,6 +138,11 @@ void boss2_firebullet_left (edict_t *self)
 
 void Boss2MachineGun (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	boss2_firebullet_left(self);
 	boss2_firebullet_right(self);
 }
@@ -385,11 +410,21 @@ mmove_t boss2_move_death = {FRAME_death2, FRAME_death50, boss2_frames_death, bos
 
 void boss2_stand (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &boss2_move_stand;
 }
 
 void boss2_run (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
 		self->monsterinfo.currentmove = &boss2_move_stand;
 	else
@@ -398,6 +433,11 @@ void boss2_run (edict_t *self)
 
 void boss2_walk (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &boss2_move_walk;
 }
 
@@ -406,6 +446,11 @@ void boss2_attack (edict_t *self)
 	vec3_t	vec;
 	float	range;
 
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSubtract (self->enemy->s.origin, self->s.origin, vec);
 	range = VectorLength (vec);
 
@@ -424,11 +469,21 @@ void boss2_attack (edict_t *self)
 
 void boss2_attack_mg (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &boss2_move_attack_mg;
 }
 
 void boss2_reattack_mg (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if ( infront(self, self->enemy) )
 		if (random() <= 0.7)
 			self->monsterinfo.currentmove = &boss2_move_attack_mg;
@@ -441,6 +496,11 @@ void boss2_reattack_mg (edict_t *self)
 
 void boss2_pain (edict_t *self, edict_t *other, float kick, int damage)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->health < (self->max_health / 2))
 		self->s.skinnum = 1;
 
@@ -468,6 +528,11 @@ void boss2_pain (edict_t *self, edict_t *other, float kick, int damage)
 
 void boss2_dead (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (self->mins, -56, -56, 0);
 	VectorSet (self->maxs, 56, 56, 80);
 	self->movetype = MOVETYPE_TOSS;
@@ -478,6 +543,11 @@ void boss2_dead (edict_t *self)
 
 void boss2_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damage, vec3_t point)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_death, 1, ATTN_NONE, 0);
 	self->deadflag = DEAD_DEAD;
 	self->takedamage = DAMAGE_NO;
@@ -495,6 +565,11 @@ qboolean Boss2_CheckAttack (edict_t *self)
 	int			enemy_range;
 	float		enemy_yaw;
 
+	if (!self)
+	{
+		return false;
+	}
+
 	if (self->enemy->health > 0)
 	{
 		// see if any entities are in the way of the shot
@@ -583,6 +658,11 @@ qboolean Boss2_CheckAttack (edict_t *self)
 */
 void SP_monster_boss2 (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);

src/monster/boss3/boss3.c

@@ -11,6 +11,11 @@ boss3
 
 void Use_Boss3 (edict_t *ent, edict_t *other, edict_t *activator)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	gi.WriteByte (svc_temp_entity);
 	gi.WriteByte (TE_BOSSTPORT);
 	gi.WritePosition (ent->s.origin);
@@ -20,6 +25,11 @@ void Use_Boss3 (edict_t *ent, edict_t *other, edict_t *activator)
 
 void Think_Boss3Stand (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->s.frame == FRAME_stand260)
 		ent->s.frame = FRAME_stand201;
 	else
@@ -33,6 +43,11 @@ Just stands and cycles in one place until targeted, then teleports away.
 */
 void SP_monster_boss3_stand (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);

src/monster/boss3/boss31.c

@@ -35,6 +35,11 @@ void jorg_search (edict_t *self)
 {
 	float r;
 
+	if (!self)
+	{
+		return;
+	}
+
 	r = random();
 
 	if (r <= 0.3)
@@ -119,28 +124,53 @@ mmove_t	jorg_move_stand = {FRAME_stand01, FRAME_stand51, jorg_frames_stand, NULL
 
 void jorg_idle (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_idle, 1, ATTN_NORM,0);
 }
 
 void jorg_death_hit (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_BODY, sound_death_hit, 1, ATTN_NORM,0);
 }
 
 
 void jorg_step_left (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_BODY, sound_step_left, 1, ATTN_NORM,0);
 }
 
 void jorg_step_right (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_BODY, sound_step_right, 1, ATTN_NORM,0);
 }
 
 
 void jorg_stand (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &jorg_move_stand;
 }
 
@@ -209,11 +239,21 @@ mmove_t jorg_move_end_walk = {FRAME_walk20, FRAME_walk25, jorg_frames_end_walk,
 
 void jorg_walk (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &jorg_move_walk;
 }
 
 void jorg_run (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
 		self->monsterinfo.currentmove = &jorg_move_stand;
 	else
@@ -374,6 +414,11 @@ mmove_t jorg_move_end_attack1 = {FRAME_attak115, FRAME_attak118, jorg_frames_end
 
 void jorg_reattack1(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (visible(self, self->enemy))
 		if (random() < 0.9)
 			self->monsterinfo.currentmove = &jorg_move_attack1;
@@ -391,11 +436,20 @@ void jorg_reattack1(edict_t *self)
 
 void jorg_attack1(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &jorg_move_attack1;
 }
 
 void jorg_pain (edict_t *self, edict_t *other, float kick, int damage)
 {
+	if (!self)
+	{
+		return;
+	}
 
 	if (self->health < (self->max_health / 2))
 			self->s.skinnum = 1;
@@ -460,6 +514,11 @@ void jorgBFG (edict_t *self)
 	vec3_t	dir;
 	vec3_t	vec;
 
+	if (!self)
+	{
+		return;
+	}
+
 	AngleVectors (self->s.angles, forward, right, NULL);
 	G_ProjectSource (self->s.origin, monster_flash_offset[MZ2_JORG_BFG_1], forward, right, start);
 
@@ -476,6 +535,11 @@ void jorg_firebullet_right (edict_t *self)
 	vec3_t	forward, right, target;
 	vec3_t	start;
 
+	if (!self)
+	{
+		return;
+	}
+
 	AngleVectors (self->s.angles, forward, right, NULL);
 	G_ProjectSource (self->s.origin, monster_flash_offset[MZ2_JORG_MACHINEGUN_R1], forward, right, start);
 
@@ -498,6 +562,11 @@ void jorg_firebullet_left (edict_t *self)
 	vec3_t	forward, right, target;
 	vec3_t	start;
 
+	if (!self)
+	{
+		return;
+	}
+
 	AngleVectors (self->s.angles, forward, right, NULL);
 	G_ProjectSource (self->s.origin, monster_flash_offset[MZ2_JORG_MACHINEGUN_L1], forward, right, start);
 
@@ -517,6 +586,11 @@ void jorg_firebullet_left (edict_t *self)
 
 void jorg_firebullet (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	jorg_firebullet_left(self);
 	jorg_firebullet_right(self);
 }
@@ -526,6 +600,11 @@ void jorg_attack(edict_t *self)
 	vec3_t	vec;
 	float	range;
 
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSubtract (self->enemy->s.origin, self->s.origin, vec);
 	range = VectorLength (vec);
 
@@ -549,6 +628,11 @@ void jorg_dead (edict_t *self)
 
 void jorg_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damage, vec3_t point)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_death, 1, ATTN_NORM, 0);
 	self->deadflag = DEAD_DEAD;
 	self->takedamage = DAMAGE_NO;
@@ -567,6 +651,11 @@ qboolean Jorg_CheckAttack (edict_t *self)
 	int			enemy_range;
 	float		enemy_yaw;
 
+	if (!self)
+	{
+		return false;
+	}
+
 	if (self->enemy->health > 0)
 	{
 		// see if any entities are in the way of the shot
@@ -656,6 +745,11 @@ void MakronPrecache (void);
 */
 void SP_monster_jorg (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);

src/monster/boss3/boss32.c

@@ -38,6 +38,11 @@ void makron_taunt (edict_t *self)
 {
 	float r;
 
+	if (!self)
+	{
+		return;
+	}
+
 	r=random();
 	if (r <= 0.3)
 		gi.sound (self, CHAN_AUTO, sound_taunt1, 1, ATTN_NONE, 0);
@@ -118,6 +123,11 @@ mmove_t	makron_move_stand = {FRAME_stand201, FRAME_stand260, makron_frames_stand
 	
 void makron_stand (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &makron_move_stand;
 }
 
@@ -138,31 +148,61 @@ mmove_t	makron_move_run = {FRAME_walk204, FRAME_walk213, makron_frames_run, NULL
 
 void makron_hit (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_AUTO, sound_hit, 1, ATTN_NONE,0);
 }
 
 void makron_popup (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_BODY, sound_popup, 1, ATTN_NONE,0);
 }
 
 void makron_step_left (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_BODY, sound_step_left, 1, ATTN_NORM,0);
 }
 
 void makron_step_right (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_BODY, sound_step_right, 1, ATTN_NORM,0);
 }
 
 void makron_brainsplorch (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_brainsplorch, 1, ATTN_NORM,0);
 }
 
 void makron_prerailgun (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_WEAPON, sound_prerailgun, 1, ATTN_NORM,0);
 }
 
@@ -184,11 +224,21 @@ mmove_t	makron_move_walk = {FRAME_walk204, FRAME_walk213, makron_frames_run, NUL
 
 void makron_walk (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &makron_move_walk;
 }
 
 void makron_run (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
 		self->monsterinfo.currentmove = &makron_move_stand;
 	else
@@ -395,6 +445,11 @@ void makronBFG (edict_t *self)
 	vec3_t	dir;
 	vec3_t	vec;
 
+	if (!self)
+	{
+		return;
+	}
+
 	AngleVectors (self->s.angles, forward, right, NULL);
 	G_ProjectSource (self->s.origin, monster_flash_offset[MZ2_MAKRON_BFG], forward, right, start);
 
@@ -480,6 +535,11 @@ mmove_t makron_move_attack5 = {FRAME_attak501, FRAME_attak516, makron_frames_att
 
 void MakronSaveloc (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	VectorCopy (self->enemy->s.origin, self->pos1);	//save for aiming the shot
 	self->pos1[2] += self->enemy->viewheight;
 }
@@ -491,6 +551,11 @@ void MakronRailgun (edict_t *self)
 	vec3_t	dir;
 	vec3_t	forward, right;
 
+	if (!self)
+	{
+		return;
+	}
+
 	AngleVectors (self->s.angles, forward, right, NULL);
 	G_ProjectSource (self->s.origin, monster_flash_offset[MZ2_MAKRON_RAILGUN_1], forward, right, start);
 	
@@ -510,6 +575,11 @@ void MakronHyperblaster (edict_t *self)
 	vec3_t	forward, right;
 	int		flash_number;
 
+	if (!self)
+	{
+		return;
+	}
+
 	flash_number = MZ2_MAKRON_BLASTER_1 + (self->s.frame - FRAME_attak405);
 
 	AngleVectors (self->s.angles, forward, right, NULL);
@@ -541,6 +611,11 @@ void MakronHyperblaster (edict_t *self)
 
 void makron_pain (edict_t *self, edict_t *other, float kick, int damage)
 {
+	if (!self)
+	{
+		return;
+	}
+
 
 	if (self->health < (self->max_health / 2))
 			self->s.skinnum = 1;
@@ -589,6 +664,11 @@ void makron_pain (edict_t *self, edict_t *other, float kick, int damage)
 
 void makron_sight(edict_t *self, edict_t *other)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &makron_move_sight;
 }
 
@@ -598,6 +678,11 @@ void makron_attack(edict_t *self)
 	float	range;
 	float	r;
 
+	if (!self)
+	{
+		return;
+	}
+
 	r = random();
 
 	VectorSubtract (self->enemy->s.origin, self->s.origin, vec);
@@ -620,6 +705,11 @@ Makron Torso. This needs to be spawned in
 
 void makron_torso_think (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (++self->s.frame < 365)
 		self->nextthink = level.time + FRAMETIME;
 	else
@@ -631,6 +721,11 @@ void makron_torso_think (edict_t *self)
 
 void makron_torso (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->movetype = MOVETYPE_NONE;
 	ent->solid = SOLID_NOT;
 	VectorSet (ent->mins, -8, -8, 0);
@@ -650,6 +745,11 @@ void makron_torso (edict_t *ent)
 
 void makron_dead (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (self->mins, -60, -60, 0);
 	VectorSet (self->maxs, 60, 60, 72);
 	self->movetype = MOVETYPE_TOSS;
@@ -665,6 +765,11 @@ void makron_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damag
 
 	int		n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	self->s.sound = 0;
 	// check for gib
 	if (self->health <= self->gib_health)
@@ -707,6 +812,11 @@ qboolean Makron_CheckAttack (edict_t *self)
 	int			enemy_range;
 	float		enemy_yaw;
 
+	if (!self)
+	{
+		return false;
+	}
+
 	if (self->enemy->health > 0)
 	{
 	// see if any entities are in the way of the shot
@@ -818,6 +928,11 @@ void MakronPrecache (void)
 */
 void SP_monster_makron (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);
@@ -867,6 +982,11 @@ void MakronSpawn (edict_t *self)
 	vec3_t		vec;
 	edict_t		*player;
 
+	if (!self)
+	{
+		return;
+	}
+
 	SP_monster_makron (self);
 
 	// jump at player
@@ -893,6 +1013,11 @@ void MakronToss (edict_t *self)
 {
 	edict_t	*ent;
 
+	if (!self)
+	{
+		return;
+	}
+
 	ent = G_Spawn ();
 	ent->nextthink = level.time + 0.8;
 	ent->think = MakronSpawn;

src/monster/brain/brain.c

@@ -28,11 +28,21 @@ static int	sound_melee3;
 
 void brain_sight (edict_t *self, edict_t *other)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_sight, 1, ATTN_NORM, 0);
 }
 
 void brain_search (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_search, 1, ATTN_NORM, 0);
 }
 
@@ -84,6 +94,11 @@ mmove_t brain_move_stand = {FRAME_stand01, FRAME_stand30, brain_frames_stand, NU
 
 void brain_stand (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &brain_move_stand;
 }
 
@@ -131,6 +146,11 @@ mmove_t brain_move_idle = {FRAME_stand31, FRAME_stand60, brain_frames_idle, brai
 
 void brain_idle (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_AUTO, sound_idle3, 1, ATTN_IDLE, 0);
 	self->monsterinfo.currentmove = &brain_move_idle;
 }
@@ -158,6 +178,11 @@ mmove_t brain_move_walk1 = {FRAME_walk101, FRAME_walk111, brain_frames_walk1, NU
 
 void brain_walk (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &brain_move_walk1;
 }
 
@@ -234,6 +259,11 @@ mmove_t brain_move_pain1 = {FRAME_pain101, FRAME_pain121, brain_frames_pain1, br
 
 void brain_duck_down (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_DUCKED)
 		return;
 	self->monsterinfo.aiflags |= AI_DUCKED;
@@ -244,6 +274,11 @@ void brain_duck_down (edict_t *self)
 
 void brain_duck_hold (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (level.time >= self->monsterinfo.pausetime)
 		self->monsterinfo.aiflags &= ~AI_HOLD_FRAME;
 	else
@@ -252,6 +287,11 @@ void brain_duck_hold (edict_t *self)
 
 void brain_duck_up (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.aiflags &= ~AI_DUCKED;
 	self->maxs[2] += 32;
 	self->takedamage = DAMAGE_AIM;
@@ -273,6 +313,11 @@ mmove_t brain_move_duck = {FRAME_duck01, FRAME_duck08, brain_frames_duck, brain_
 
 void brain_dodge (edict_t *self, edict_t *attacker, float eta)
 {
+	if (!self || !attacker)
+	{
+		return;
+	}
+
 	if (random() > 0.25)
 		return;
 
@@ -324,6 +369,11 @@ mmove_t brain_move_death1 = {FRAME_death101, FRAME_death118, brain_frames_death1
 
 void brain_swing_right (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_BODY, sound_melee1, 1, ATTN_NORM, 0);
 }
 
@@ -331,6 +381,11 @@ void brain_hit_right (edict_t *self)
 {
 	vec3_t	aim;
 
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (aim, MELEE_DISTANCE, self->maxs[0], 8);
 	if (fire_hit (self, aim, (15 + (rand() %5)), 40))
 		gi.sound (self, CHAN_WEAPON, sound_melee3, 1, ATTN_NORM, 0);
@@ -338,6 +393,11 @@ void brain_hit_right (edict_t *self)
 
 void brain_swing_left (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_BODY, sound_melee2, 1, ATTN_NORM, 0);
 }
 
@@ -345,6 +405,11 @@ void brain_hit_left (edict_t *self)
 {
 	vec3_t	aim;
 
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (aim, MELEE_DISTANCE, self->mins[0], 8);
 	if (fire_hit (self, aim, (15 + (rand() %5)), 40))
 		gi.sound (self, CHAN_WEAPON, sound_melee3, 1, ATTN_NORM, 0);
@@ -375,6 +440,11 @@ mmove_t brain_move_attack1 = {FRAME_attak101, FRAME_attak118, brain_frames_attac
 
 void brain_chest_open (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->spawnflags &= ~65536;
 	self->monsterinfo.power_armor_type = POWER_ARMOR_NONE;
 	gi.sound (self, CHAN_BODY, sound_chest_open, 1, ATTN_NORM, 0);
@@ -384,6 +454,11 @@ void brain_tentacle_attack (edict_t *self)
 {
 	vec3_t	aim;
 
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (aim, MELEE_DISTANCE, 0, 8);
 	if (fire_hit (self, aim, (10 + (rand() %5)), -600) && skill->value > SKILL_EASY)
 		self->spawnflags |= 65536;
@@ -392,6 +467,11 @@ void brain_tentacle_attack (edict_t *self)
 
 void brain_chest_closed (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.power_armor_type = POWER_ARMOR_SCREEN;
 	if (self->spawnflags & 65536)
 	{
@@ -424,6 +504,11 @@ mmove_t brain_move_attack2 = {FRAME_attak201, FRAME_attak217, brain_frames_attac
 
 void brain_melee(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (random() <= 0.5)
 		self->monsterinfo.currentmove = &brain_move_attack1;
 	else
@@ -453,6 +538,11 @@ mmove_t brain_move_run = {FRAME_walk101, FRAME_walk111, brain_frames_run, NULL};
 
 void brain_run (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.power_armor_type = POWER_ARMOR_SCREEN;
 	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
 		self->monsterinfo.currentmove = &brain_move_stand;
@@ -465,6 +555,11 @@ void brain_pain (edict_t *self, edict_t *other, float kick, int damage)
 {
 	float	r;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->health < (self->max_health / 2))
 		self->s.skinnum = 1;
 
@@ -495,6 +590,11 @@ void brain_pain (edict_t *self, edict_t *other, float kick, int damage)
 
 void brain_dead (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (self->mins, -16, -16, -24);
 	VectorSet (self->maxs, 16, 16, -8);
 	self->movetype = MOVETYPE_TOSS;
@@ -509,6 +609,11 @@ void brain_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damage
 {
 	int		n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	self->s.effects = 0;
 	self->monsterinfo.power_armor_type = POWER_ARMOR_NONE;
 
@@ -542,6 +647,11 @@ void brain_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damage
 */
 void SP_monster_brain (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);

src/monster/chick/chick.c

@@ -36,6 +36,11 @@ static int	sound_search;
 
 void ChickMoan (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (random() < 0.5)
 		gi.sound (self, CHAN_VOICE, sound_idle1, 1, ATTN_IDLE, 0);
 	else
@@ -79,6 +84,11 @@ mmove_t chick_move_fidget = {FRAME_stand201, FRAME_stand230, chick_frames_fidget
 
 void chick_fidget (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
 		return;
 	if (random() <= 0.3)
@@ -123,6 +133,11 @@ mmove_t chick_move_stand = {FRAME_stand101, FRAME_stand130, chick_frames_stand,
 
 void chick_stand (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &chick_move_stand;
 }
 
@@ -176,11 +191,21 @@ mmove_t chick_move_walk = {FRAME_walk11, FRAME_walk20, chick_frames_walk, NULL};
 
 void chick_walk (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &chick_move_walk;
 }
 
 void chick_run (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
 	{
 		self->monsterinfo.currentmove = &chick_move_stand;
@@ -248,6 +273,11 @@ void chick_pain (edict_t *self, edict_t *other, float kick, int damage)
 {
 	float	r;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->health < (self->max_health / 2))
 		self->s.skinnum = 1;
 
@@ -277,6 +307,11 @@ void chick_pain (edict_t *self, edict_t *other, float kick, int damage)
 
 void chick_dead (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (self->mins, -16, -16, 0);
 	VectorSet (self->maxs, 16, 16, 16);
 	self->movetype = MOVETYPE_TOSS;
@@ -335,6 +370,11 @@ void chick_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damage
 {
 	int		n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	// check for gib
 	if (self->health <= self->gib_health)
 	{
@@ -371,6 +411,11 @@ void chick_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damage
 
 void chick_duck_down (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_DUCKED)
 		return;
 	self->monsterinfo.aiflags |= AI_DUCKED;
@@ -382,6 +427,11 @@ void chick_duck_down (edict_t *self)
 
 void chick_duck_hold (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (level.time >= self->monsterinfo.pausetime)
 		self->monsterinfo.aiflags &= ~AI_HOLD_FRAME;
 	else
@@ -390,6 +440,11 @@ void chick_duck_hold (edict_t *self)
 
 void chick_duck_up (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.aiflags &= ~AI_DUCKED;
 	self->maxs[2] += 32;
 	self->takedamage = DAMAGE_AIM;
@@ -410,6 +465,11 @@ mmove_t chick_move_duck = {FRAME_duck01, FRAME_duck07, chick_frames_duck, chick_
 
 void chick_dodge (edict_t *self, edict_t *attacker, float eta)
 {
+	if (!self || !attacker)
+	{
+		return;
+	}
+
 	if (random() > 0.25)
 		return;
 
@@ -423,6 +483,11 @@ void ChickSlash (edict_t *self)
 {
 	vec3_t	aim;
 
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (aim, MELEE_DISTANCE, self->mins[0], 10);
 	gi.sound (self, CHAN_WEAPON, sound_melee_swing, 1, ATTN_NORM, 0);
 	fire_hit (self, aim, (10 + (rand() %6)), 100);
@@ -436,6 +501,11 @@ void ChickRocket (edict_t *self)
 	vec3_t	dir;
 	vec3_t	vec;
 
+	if (!self)
+	{
+		return;
+	}
+
 	AngleVectors (self->s.angles, forward, right, NULL);
 	G_ProjectSource (self->s.origin, monster_flash_offset[MZ2_CHICK_ROCKET_1], forward, right, start);
 
@@ -449,11 +519,21 @@ void ChickRocket (edict_t *self)
 
 void Chick_PreAttack1 (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_missile_prelaunch, 1, ATTN_NORM, 0);
 }
 
 void ChickReload (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_missile_reload, 1, ATTN_NORM, 0);
 }
 
@@ -509,6 +589,11 @@ mmove_t chick_move_end_attack1 = {FRAME_attak128, FRAME_attak132, chick_frames_e
 
 void chick_rerocket(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->enemy->health > 0)
 	{
 		if (range (self, self->enemy) > RANGE_MELEE)
@@ -524,6 +609,11 @@ void chick_rerocket(edict_t *self)
 
 void chick_attack1(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &chick_move_attack1;
 }
 
@@ -553,6 +643,11 @@ mmove_t chick_move_end_slash = {FRAME_attak213, FRAME_attak216, chick_frames_end
 
 void chick_reslash(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->enemy->health > 0)
 	{
 		if (range (self, self->enemy) == RANGE_MELEE)
@@ -574,6 +669,11 @@ void chick_reslash(edict_t *self)
 
 void chick_slash(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &chick_move_slash;
 }
 
@@ -590,17 +690,32 @@ mmove_t chick_move_start_slash = {FRAME_attak201, FRAME_attak203, chick_frames_s
 
 void chick_melee(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &chick_move_start_slash;
 }
 
 
 void chick_attack(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &chick_move_start_attack1;
 }
 
 void chick_sight(edict_t *self, edict_t *other)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_sight, 1, ATTN_NORM, 0);
 }
 
@@ -608,6 +723,11 @@ void chick_sight(edict_t *self, edict_t *other)
 */
 void SP_monster_chick (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);

src/monster/flipper/flipper.c

@@ -31,6 +31,11 @@ mmove_t	flipper_move_stand = {FRAME_flphor01, FRAME_flphor01, flipper_frames_sta
 
 void flipper_stand (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &flipper_move_stand;
 }
 
@@ -69,6 +74,11 @@ mmove_t flipper_move_run_loop = {FRAME_flpver06, FRAME_flpver29, flipper_frames_
 
 void flipper_run_loop (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &flipper_move_run_loop;
 }
 
@@ -85,6 +95,11 @@ mmove_t flipper_move_run_start = {FRAME_flpver01, FRAME_flpver06, flipper_frames
 
 void flipper_run (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &flipper_move_run_start;
 }
 
@@ -120,6 +135,11 @@ mmove_t flipper_move_walk = {FRAME_flphor01, FRAME_flphor24, flipper_frames_walk
 
 void flipper_walk (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &flipper_move_walk;
 }
 
@@ -135,6 +155,11 @@ mmove_t flipper_move_start_run = {FRAME_flphor01, FRAME_flphor05, flipper_frames
 
 void flipper_start_run (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &flipper_move_start_run;
 }
 
@@ -162,12 +187,22 @@ void flipper_bite (edict_t *self)
 {
 	vec3_t	aim;
 
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (aim, MELEE_DISTANCE, 0, 0);
 	fire_hit (self, aim, 5, 0);
 }
 
 void flipper_preattack (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_WEAPON, sound_chomp, 1, ATTN_NORM, 0);
 }
 
@@ -198,6 +233,11 @@ mmove_t flipper_move_attack = {FRAME_flpbit01, FRAME_flpbit20, flipper_frames_at
 
 void flipper_melee(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &flipper_move_attack;
 }
 
@@ -205,6 +245,11 @@ void flipper_pain (edict_t *self, edict_t *other, float kick, int damage)
 {
 	int		n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->health < (self->max_health / 2))
 		self->s.skinnum = 1;
 
@@ -231,6 +276,11 @@ void flipper_pain (edict_t *self, edict_t *other, float kick, int damage)
 
 void flipper_dead (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (self->mins, -16, -16, -24);
 	VectorSet (self->maxs, 16, 16, -8);
 	self->movetype = MOVETYPE_TOSS;
@@ -307,6 +357,11 @@ mmove_t flipper_move_death = {FRAME_flpdth01, FRAME_flpdth56, flipper_frames_dea
 
 void flipper_sight (edict_t *self, edict_t *other)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_sight, 1, ATTN_NORM, 0);
 }
 
@@ -314,6 +369,11 @@ void flipper_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int dama
 {
 	int		n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	// check for gib
 	if (self->health <= self->gib_health)
 	{
@@ -341,6 +401,11 @@ void flipper_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int dama
 */
 void SP_monster_flipper (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);

src/monster/float/float.c

@@ -21,11 +21,21 @@ static int	sound_sight;
 
 void floater_sight (edict_t *self, edict_t *other)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_sight, 1, ATTN_NORM, 0);
 }
 
 void floater_idle (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_idle, 1, ATTN_IDLE, 0);
 }
 
@@ -45,6 +55,11 @@ void floater_fire_blaster (edict_t *self)
 	vec3_t	dir;
 	int		effect;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if ((self->s.frame == FRAME_attak104) || (self->s.frame == FRAME_attak107))
 		effect = EF_HYPERBLASTER;
 	else
@@ -176,6 +191,11 @@ mmove_t	floater_move_stand2 = {FRAME_stand201, FRAME_stand252, floater_frames_st
 
 void floater_stand (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (random() <= 0.5)
 		self->monsterinfo.currentmove = &floater_move_stand1;
 	else
@@ -481,6 +501,11 @@ mmove_t	floater_move_run = {FRAME_stand101, FRAME_stand152, floater_frames_run,
 
 void floater_run (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
 		self->monsterinfo.currentmove = &floater_move_stand1;
 	else
@@ -489,12 +514,23 @@ void floater_run (edict_t *self)
 
 void floater_walk (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &floater_move_walk;
 }
 
 void floater_wham (edict_t *self)
 {
 	static	vec3_t	aim = {MELEE_DISTANCE, 0, 0};
+
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_WEAPON, sound_attack3, 1, ATTN_NORM, 0);
 	fire_hit (self, aim, 5 + rand() % 6, -50);
 }
@@ -506,6 +542,11 @@ void floater_zap (edict_t *self)
 	vec3_t	dir;
 	vec3_t	offset;
 
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSubtract (self->enemy->s.origin, self->s.origin, dir);
 
 	AngleVectors (self->s.angles, forward, right, NULL);
@@ -529,12 +570,22 @@ void floater_zap (edict_t *self)
 
 void floater_attack(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &floater_move_attack1;
 }
 
 
 void floater_melee(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (random() < 0.5)
 		self->monsterinfo.currentmove = &floater_move_attack3;
 	else
@@ -546,6 +597,11 @@ void floater_pain (edict_t *self, edict_t *other, float kick, int damage)
 {
 	int		n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->health < (self->max_health / 2))
 		self->s.skinnum = 1;
 
@@ -571,6 +627,11 @@ void floater_pain (edict_t *self, edict_t *other, float kick, int damage)
 
 void floater_dead (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (self->mins, -16, -16, -24);
 	VectorSet (self->maxs, 16, 16, -8);
 	self->movetype = MOVETYPE_TOSS;
@@ -581,6 +642,11 @@ void floater_dead (edict_t *self)
 
 void floater_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damage, vec3_t point)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_death1, 1, ATTN_NORM, 0);
 	BecomeExplosion1(self);
 }
@@ -589,6 +655,11 @@ void floater_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int dama
 */
 void SP_monster_floater (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);

src/monster/flyer/flyer.c

@@ -32,16 +32,31 @@ void flyer_nextmove (edict_t *self);
 
 void flyer_sight (edict_t *self, edict_t *other)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_sight, 1, ATTN_NORM, 0);
 }
 
 void flyer_idle (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_idle, 1, ATTN_IDLE, 0);
 }
 
 void flyer_pop_blades (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_sproing, 1, ATTN_NORM, 0);
 }
 
@@ -199,6 +214,11 @@ mmove_t	flyer_move_run = {FRAME_stand01, FRAME_stand45, flyer_frames_run, NULL};
 
 void flyer_run (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
 		self->monsterinfo.currentmove = &flyer_move_stand;
 	else
@@ -207,11 +227,21 @@ void flyer_run (edict_t *self)
 
 void flyer_walk (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &flyer_move_walk;
 }
 
 void flyer_stand (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &flyer_move_stand;
 }
 
@@ -240,11 +270,21 @@ mmove_t flyer_move_stop = {FRAME_stop01, FRAME_stop07, flyer_frames_stop, NULL};
 
 void flyer_stop (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &flyer_move_stop;
 }
 
 void flyer_start (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &flyer_move_start;
 }
 
@@ -353,6 +393,11 @@ void flyer_fire (edict_t *self, int flash_number)
 	vec3_t	dir;
 	int		effect;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if ((self->s.frame == FRAME_attak204) || (self->s.frame == FRAME_attak207) || (self->s.frame == FRAME_attak210))
 		effect = EF_HYPERBLASTER;
 	else
@@ -369,11 +414,21 @@ void flyer_fire (edict_t *self, int flash_number)
 
 void flyer_fireleft (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	flyer_fire (self, MZ2_FLYER_BLASTER_1);
 }
 
 void flyer_fireright (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	flyer_fire (self, MZ2_FLYER_BLASTER_2);
 }
 
@@ -405,6 +460,11 @@ void flyer_slash_left (edict_t *self)
 {
 	vec3_t	aim;
 
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (aim, MELEE_DISTANCE, self->mins[0], 0);
 	fire_hit (self, aim, 5, 0);
 	gi.sound (self, CHAN_WEAPON, sound_slash, 1, ATTN_NORM, 0);
@@ -414,6 +474,11 @@ void flyer_slash_right (edict_t *self)
 {
 	vec3_t	aim;
 
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (aim, MELEE_DISTANCE, self->maxs[0], 0);
 	fire_hit (self, aim, 5, 0);
 	gi.sound (self, CHAN_WEAPON, sound_slash, 1, ATTN_NORM, 0);
@@ -459,6 +524,11 @@ mmove_t flyer_move_loop_melee = {FRAME_attak107, FRAME_attak118, flyer_frames_lo
 
 void flyer_loop_melee (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &flyer_move_loop_melee;
 }
 
@@ -466,17 +536,32 @@ void flyer_loop_melee (edict_t *self)
 
 void flyer_attack (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &flyer_move_attack2;
 }
 
 void flyer_setstart (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	nextmove = ACTION_run;
 	self->monsterinfo.currentmove = &flyer_move_start;
 }
 
 void flyer_nextmove (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (nextmove == ACTION_attack1)
 		self->monsterinfo.currentmove = &flyer_move_start_melee;
 	else if (nextmove == ACTION_attack2)
@@ -487,11 +572,21 @@ void flyer_nextmove (edict_t *self)
 
 void flyer_melee (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &flyer_move_start_melee;
 }
 
 void flyer_check_melee(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (range (self, self->enemy) == RANGE_MELEE)
 		if (random() <= 0.8)
 			self->monsterinfo.currentmove = &flyer_move_loop_melee;
@@ -505,6 +600,11 @@ void flyer_pain (edict_t *self, edict_t *other, float kick, int damage)
 {
 	int		n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->health < (self->max_health / 2))
 		self->s.skinnum = 1;
 
@@ -536,6 +636,11 @@ void flyer_pain (edict_t *self, edict_t *other, float kick, int damage)
 
 void flyer_die(edict_t *self, edict_t *inflictor, edict_t *attacker, int damage, vec3_t point)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_die, 1, ATTN_NORM, 0);
 	BecomeExplosion1(self);
 }
@@ -545,6 +650,11 @@ void flyer_die(edict_t *self, edict_t *inflictor, edict_t *attacker, int damage,
 */
 void SP_monster_flyer (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);

src/monster/gladiator/gladiator.c

@@ -24,21 +24,41 @@ static int	sound_sight;
 
 void gladiator_idle (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_idle, 1, ATTN_IDLE, 0);
 }
 
 void gladiator_sight (edict_t *self, edict_t *other)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_sight, 1, ATTN_NORM, 0);
 }
 
 void gladiator_search (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_search, 1, ATTN_NORM, 0);
 }
 
 void gladiator_cleaver_swing (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_WEAPON, sound_cleaver_swing, 1, ATTN_NORM, 0);
 }
 
@@ -56,6 +76,11 @@ mmove_t gladiator_move_stand = {FRAME_stand1, FRAME_stand7, gladiator_frames_sta
 
 void gladiator_stand (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &gladiator_move_stand;
 }
 
@@ -83,6 +108,11 @@ mmove_t gladiator_move_walk = {FRAME_walk1, FRAME_walk16, gladiator_frames_walk,
 
 void gladiator_walk (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &gladiator_move_walk;
 }
 
@@ -100,6 +130,11 @@ mmove_t gladiator_move_run = {FRAME_run1, FRAME_run6, gladiator_frames_run, NULL
 
 void gladiator_run (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
 		self->monsterinfo.currentmove = &gladiator_move_stand;
 	else
@@ -111,6 +146,11 @@ void GaldiatorMelee (edict_t *self)
 {
 	vec3_t	aim;
 
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (aim, MELEE_DISTANCE, self->mins[0], -4);
 	if (fire_hit (self, aim, (20 + (rand() %5)), 300))
 		gi.sound (self, CHAN_AUTO, sound_cleaver_hit, 1, ATTN_NORM, 0);
@@ -142,6 +182,11 @@ mmove_t gladiator_move_attack_melee = {FRAME_melee1, FRAME_melee17, gladiator_fr
 
 void gladiator_melee(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &gladiator_move_attack_melee;
 }
 
@@ -152,6 +197,11 @@ void GladiatorGun (edict_t *self)
 	vec3_t	dir;
 	vec3_t	forward, right;
 
+	if (!self)
+	{
+		return;
+	}
+
 	AngleVectors (self->s.angles, forward, right, NULL);
 	G_ProjectSource (self->s.origin, monster_flash_offset[MZ2_GLADIATOR_RAILGUN_1], forward, right, start);
 
@@ -181,6 +231,11 @@ void gladiator_attack(edict_t *self)
 	float	range;
 	vec3_t	v;
 
+	if (!self)
+	{
+		return;
+	}
+
 	// a small safe zone
 	VectorSubtract (self->s.origin, self->enemy->s.origin, v);
 	range = VectorLength(v);
@@ -220,6 +275,10 @@ mmove_t gladiator_move_pain_air = {FRAME_painup1, FRAME_painup7, gladiator_frame
 
 void gladiator_pain (edict_t *self, edict_t *other, float kick, int damage)
 {
+	if (!self)
+	{
+		return;
+	}
 
 	if (self->health < (self->max_health / 2))
 		self->s.skinnum = 1;
@@ -251,6 +310,11 @@ void gladiator_pain (edict_t *self, edict_t *other, float kick, int damage)
 
 void gladiator_dead (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (self->mins, -16, -16, -24);
 	VectorSet (self->maxs, 16, 16, -8);
 	self->movetype = MOVETYPE_TOSS;
@@ -290,6 +354,11 @@ void gladiator_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int da
 {
 	int		n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	// check for gib
 	if (self->health <= self->gib_health)
 	{
@@ -319,6 +388,11 @@ void gladiator_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int da
 */
 void SP_monster_gladiator (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);

src/monster/gunner/gunner.c

@@ -21,16 +21,31 @@ static int	sound_sight;
 
 void gunner_idlesound (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_idle, 1, ATTN_IDLE, 0);
 }
 
 void gunner_sight (edict_t *self, edict_t *other)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_sight, 1, ATTN_NORM, 0);
 }
 
 void gunner_search (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_search, 1, ATTN_NORM, 0);
 }
 
@@ -104,6 +119,11 @@ mmove_t	gunner_move_fidget = {FRAME_stand31, FRAME_stand70, gunner_frames_fidget
 
 void gunner_fidget (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
 		return;
 	if (random() <= 0.05)
@@ -149,6 +169,11 @@ mmove_t	gunner_move_stand = {FRAME_stand01, FRAME_stand30, gunner_frames_stand,
 
 void gunner_stand (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &gunner_move_stand;
 }
 
@@ -173,6 +198,11 @@ mmove_t gunner_move_walk = {FRAME_walk07, FRAME_walk19, gunner_frames_walk, NULL
 
 void gunner_walk (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &gunner_move_walk;
 }
 
@@ -192,6 +222,11 @@ mmove_t gunner_move_run = {FRAME_run01, FRAME_run08, gunner_frames_run, NULL};
 
 void gunner_run (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
 		self->monsterinfo.currentmove = &gunner_move_stand;
 	else
@@ -212,6 +247,11 @@ mmove_t gunner_move_runandshoot = {FRAME_runs01, FRAME_runs06, gunner_frames_run
 
 void gunner_runandshoot (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &gunner_move_runandshoot;
 }
 
@@ -263,6 +303,11 @@ mmove_t gunner_move_pain1 = {FRAME_pain101, FRAME_pain118, gunner_frames_pain1,
 
 void gunner_pain (edict_t *self, edict_t *other, float kick, int damage)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->health < (self->max_health / 2))
 		self->s.skinnum = 1;
 
@@ -289,6 +334,11 @@ void gunner_pain (edict_t *self, edict_t *other, float kick, int damage)
 
 void gunner_dead (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (self->mins, -16, -16, -24);
 	VectorSet (self->maxs, 16, 16, -8);
 	self->movetype = MOVETYPE_TOSS;
@@ -317,6 +367,11 @@ void gunner_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damag
 {
 	int		n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	// check for gib
 	if (self->health <= self->gib_health)
 	{
@@ -343,6 +398,11 @@ void gunner_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damag
 
 void gunner_duck_down (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_DUCKED)
 		return;
 	self->monsterinfo.aiflags |= AI_DUCKED;
@@ -360,6 +420,11 @@ void gunner_duck_down (edict_t *self)
 
 void gunner_duck_hold (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (level.time >= self->monsterinfo.pausetime)
 		self->monsterinfo.aiflags &= ~AI_HOLD_FRAME;
 	else
@@ -368,6 +433,11 @@ void gunner_duck_hold (edict_t *self)
 
 void gunner_duck_up (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.aiflags &= ~AI_DUCKED;
 	self->maxs[2] += 32;
 	self->takedamage = DAMAGE_AIM;
@@ -389,6 +459,11 @@ mmove_t	gunner_move_duck = {FRAME_duck01, FRAME_duck08, gunner_frames_duck, gunn
 
 void gunner_dodge (edict_t *self, edict_t *attacker, float eta)
 {
+	if (!self || !attacker)
+	{
+		return;
+	}
+
 	if (random() > 0.25)
 		return;
 
@@ -401,6 +476,11 @@ void gunner_dodge (edict_t *self, edict_t *attacker, float eta)
 
 void gunner_opengun (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_open, 1, ATTN_IDLE, 0);
 }
 
@@ -412,6 +492,11 @@ void GunnerFire (edict_t *self)
 	vec3_t	aim;
 	int		flash_number;
 
+	if (!self)
+	{
+		return;
+	}
+
 	flash_number = MZ2_GUNNER_MACHINEGUN_1 + (self->s.frame - FRAME_attak216);
 
 	AngleVectors (self->s.angles, forward, right, NULL);
@@ -434,6 +519,11 @@ void GunnerGrenade (edict_t *self)
 	vec3_t	aim;
 	int		flash_number;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->s.frame == FRAME_attak105)
 		flash_number = MZ2_GUNNER_GRENADE_1;
 	else if (self->s.frame == FRAME_attak108)
@@ -517,6 +607,11 @@ mmove_t gunner_move_attack_grenade = {FRAME_attak101, FRAME_attak121, gunner_fra
 
 void gunner_attack(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (range (self, self->enemy) == RANGE_MELEE)
 	{
 		self->monsterinfo.currentmove = &gunner_move_attack_chain;
@@ -532,11 +627,21 @@ void gunner_attack(edict_t *self)
 
 void gunner_fire_chain(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &gunner_move_fire_chain;
 }
 
 void gunner_refire_chain(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->enemy->health > 0)
 		if ( visible (self, self->enemy) )
 			if (random() <= 0.5)
@@ -551,6 +656,11 @@ void gunner_refire_chain(edict_t *self)
 */
 void SP_monster_gunner (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);

src/monster/handler/handler.c

@@ -24,6 +24,11 @@ static int	sound_attack;
 
 void handler_sight (edict_t *self, edict_t *other)
 {
+	if (!self || !other)
+	{
+		return;
+	}
+
 	hound_sight(self, other);
 	infantry_sight(self, other);
 }
@@ -200,6 +205,11 @@ mmove_t handler_stand5 = {FRAME_stand5start, FRAME_stand5end, handler_frames_sta
 */
 void handler_standWhatNext (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	float r = random();
 
 	if(r < 0.90)
@@ -217,6 +227,11 @@ void handler_standSitWhatNext (edict_t *self)
 {
 	float r = random();
 
+	if (!self)
+	{
+		return;
+	}
+
 	if(r < 0.70)
 	{
 		self->monsterinfo.currentmove = &handler_stand1;
@@ -234,6 +249,11 @@ void handler_standSitWhatNext (edict_t *self)
 
 void handler_stand (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if(self->monsterinfo.currentmove != &handler_stand1 &&
 		self->monsterinfo.currentmove != &handler_stand2 &&
 		self->monsterinfo.currentmove != &handler_stand3 &&
@@ -260,6 +280,11 @@ void handler_pain (edict_t *self, edict_t *other, float kick, int damage)
 
 void handler_createHound(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->s.modelindex2 = 0;
 	hound_createHound(self, (self->health / 175.0));
 }
@@ -267,6 +292,11 @@ void handler_createHound(edict_t *self)
 
 void CheckIdleLoop(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if(!self->powerarmor_time && self->spawnflags & 8)
 	{
 		self->powerarmor_time = level.time + (FRAMETIME * random() * 3);
@@ -280,6 +310,11 @@ void CheckIdleLoop(edict_t *self)
 
 void CheckForEnemy(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if(self->enemy && (self->enemy->client || (self->enemy->svflags & SVF_MONSTER)))
 	{
 		self->powerarmor_time = 0;
@@ -298,6 +333,11 @@ void CheckForEnemy(edict_t *self)
 
 void StartCount(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->powerarmor_time = level.time + 3;
 }
 
@@ -329,6 +369,11 @@ mmove_t handler_move_attack1 = {FRAME_attack1Start, FRAME_attack1End, handler_fr
 
 void handler_attack (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_attack, 1, ATTN_NORM, 0);
 
 	self->monsterinfo.currentmove = &handler_move_attack1;
@@ -344,6 +389,11 @@ Death Stuff Starts
 
 void handler_dead (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (self->mins, -16, -16, -24);
 	VectorSet (self->maxs, 16, 16, -8);
 	self->movetype = MOVETYPE_TOSS;
@@ -355,6 +405,11 @@ void handler_dead (edict_t *self)
 
 void handler_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damage, vec3_t point)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->health = 1; // can't die while together...
 }
 
@@ -380,6 +435,11 @@ void SP_monster_handler_precache(void)
 */
 void SP_monster_handler (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);
@@ -391,17 +451,17 @@ void SP_monster_handler (edict_t *self)
 	self->s.modelindex = gi.modelindex ("models/monsters/guard/handler/tris.md2");
 	self->s.modelindex2 = gi.modelindex ("models/monsters/guard/hound/tris.md2");
 
-/*
+	/*
-Handler
+		Handler
-X = -36 to 3
+		X = -36 to 3
-Y = -3  to 27
+		Y = -3  to 27
-Z = -24 to 28
+		Z = -24 to 28
 
-Hound
+		Hound
-X = -12 to 11
+		X = -12 to 11
-Y = -30 to 30
+		Y = -30 to 30
-Z = -24  to 8
+		Z = -24  to 8
-*/
+	*/
 
 	VectorSet (self->mins, -32, -32, -24);
 	VectorSet (self->maxs, 32, 32, 32);

src/monster/hound/hound.c

@@ -28,11 +28,21 @@ void hound_walk (edict_t *self);
 
 void hound_launch (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_WEAPON, sound_launch, 1, ATTN_NORM, 0);
 }
 
 void hound_sight (edict_t *self, edict_t *other)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_WEAPON, sound_sight, 1, ATTN_NORM, 0);
 }
 
@@ -100,6 +110,11 @@ mmove_t hound_stand2 = {FRAME_stand2start, FRAME_stand2end, hound_frames_stand2,
 
 void hound_stand (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (random() < 0.8)
 	{
 		self->monsterinfo.currentmove = &hound_stand1;
@@ -130,6 +145,11 @@ mmove_t hound_move_run = {FRAME_runStart, FRAME_runEnd, hound_frames_run, NULL};
 
 void hound_run (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
 		hound_stand(self);
 	else
@@ -157,6 +177,11 @@ mmove_t hound_move_walk = {FRAME_walkStart, FRAME_walkEnd, hound_frames_walk, ho
 
 void hound_walk (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &hound_move_walk;
 }
 
@@ -191,6 +216,11 @@ mmove_t hound_move_pain2 = {FRAME_pain2Start, FRAME_pain2End, hound_frames_pain2
 
 void hound_pain (edict_t *self, edict_t *other, float kick, int damage)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->health < (self->max_health / 2))
 		self->s.skinnum = 1;
 
@@ -222,6 +252,11 @@ void hound_bite (edict_t *self)
 {
 	vec3_t	aim;
 
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (aim, MELEE_DISTANCE, self->mins[0], 8);
 	if (fire_hit (self, aim, (30 + (rand() %5)), 100))
 		gi.sound (self, CHAN_WEAPON, sound_bite, 1, ATTN_NORM, 0);
@@ -233,6 +268,11 @@ void hound_bite2 (edict_t *self)
 {
 	vec3_t	aim;
 
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (aim, MELEE_DISTANCE, self->mins[0], 8);
 	fire_hit (self, aim, (30 + (rand() %5)), 100);
 }
@@ -270,6 +310,11 @@ mmove_t hound_move_attack2 = {FRAME_attack2Start, FRAME_attack2End, hound_frames
 
 void hound_attack (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (random() < 0.6)
 	{
 		self->monsterinfo.currentmove = &hound_move_attack1;
@@ -285,6 +330,11 @@ void hound_attack (edict_t *self)
 //
 void hound_jump_touch (edict_t *self, edict_t *other, cplane_t *plane, csurface_t *surf)
 {
+	if (!self || !other)
+	{
+		return;
+	}
+
 	if (self->health <= 0)
 	{
 		self->touch = NULL;
@@ -324,6 +374,11 @@ void hound_jump_takeoff (edict_t *self)
 {
 	vec3_t	forward;
 
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_jump, 1, ATTN_NORM, 0);
 	AngleVectors (self->s.angles, forward, NULL, NULL);
 	self->s.origin[2] += 1;
@@ -337,6 +392,11 @@ void hound_jump_takeoff (edict_t *self)
 
 void hound_check_landing (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->groundentity)
 	{
 		gi.sound (self, CHAN_WEAPON, sound_impact, 1, ATTN_NORM, 0);
@@ -353,6 +413,11 @@ void hound_check_landing (edict_t *self)
 
 void hound_check_landing2 (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->owner = NULL;
 
 	if (self->groundentity)
@@ -400,6 +465,11 @@ mmove_t hound_move_jump = {FRAME_leapStart, FRAME_leapEnd, hound_frames_jump, ho
 
 void hound_jump (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &hound_move_jump;
 }
 
@@ -411,6 +481,10 @@ attack check routines
 
 qboolean hound_check_melee (edict_t *self)
 {
+	if(!self) {
+		return false;
+	}
+
 	if (range (self, self->enemy) == RANGE_MELEE)
 		return true;
 	return false;
@@ -422,6 +496,10 @@ qboolean hound_check_jump (edict_t *self)
 	vec3_t	v;
 	float	distance;
 
+	if(!self) {
+		return false;
+	}
+
 	if (self->absmin[2] > (self->enemy->absmin[2] + 0.75 * self->enemy->size[2]))
 		return false;
 
@@ -447,6 +525,10 @@ qboolean hound_check_jump (edict_t *self)
 
 qboolean hound_checkattack (edict_t *self)
 {
+	if(!self) {
+		return false;
+	}
+
 	if (!self->enemy || self->enemy->health <= 0)
 		return false;
 
@@ -474,6 +556,11 @@ Death Stuff Starts
 
 void hound_dead (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (self->mins, -16, -16, -24);
 	VectorSet (self->maxs, 16, 16, -8);
 	self->movetype = MOVETYPE_TOSS;
@@ -503,6 +590,11 @@ void hound_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damage
 {
 	int		n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	// check for gib
 	if (self->health <= self->gib_health)
 	{
@@ -551,6 +643,11 @@ void SP_monster_hound_precache(void)
 */
 void SP_monster_hound (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);
@@ -610,6 +707,11 @@ void hound_createHound(edict_t *self, float healthPercent)
 {
 	edict_t *hound;
 
+	if (!self)
+	{
+		return;
+	}
+
 	hound = G_Spawn();
 
 	hound->s.modelindex = gi.modelindex ("models/monsters/guard/hound/tris.md2");

src/monster/hover/hover.c

@@ -23,11 +23,21 @@ static int	sound_search2;
 
 void hover_sight (edict_t *self, edict_t *other)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_sight, 1, ATTN_NORM, 0);
 }
 
 void hover_search (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (random() < 0.5)
 		gi.sound (self, CHAN_VOICE, sound_search1, 1, ATTN_NORM, 0);
 	else
@@ -401,6 +411,11 @@ mmove_t hover_move_end_attack = {FRAME_attak107, FRAME_attak108, hover_frames_en
 
 void hover_reattack (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->enemy->health > 0 )
 		if (visible (self, self->enemy) )
 			if (random() <= 0.6)		
@@ -420,6 +435,11 @@ void hover_fire_blaster (edict_t *self)
 	vec3_t	dir;
 	int		effect;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->s.frame == FRAME_attak104)
 		effect = EF_HYPERBLASTER;
 	else
@@ -438,11 +458,21 @@ void hover_fire_blaster (edict_t *self)
 
 void hover_stand (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &hover_move_stand;
 }
 
 void hover_run (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
 		self->monsterinfo.currentmove = &hover_move_stand;
 	else
@@ -451,22 +481,42 @@ void hover_run (edict_t *self)
 
 void hover_walk (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &hover_move_walk;
 }
 
 void hover_start_attack (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &hover_move_start_attack;
 }
 
 void hover_attack(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &hover_move_attack1;
 }
 
 
 void hover_pain (edict_t *self, edict_t *other, float kick, int damage)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->health < (self->max_health / 2))
 		self->s.skinnum = 1;
 
@@ -500,6 +550,11 @@ void hover_pain (edict_t *self, edict_t *other, float kick, int damage)
 
 void hover_deadthink (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!self->groundentity && level.time < self->timestamp)
 	{
 		self->nextthink = level.time + FRAMETIME;
@@ -510,6 +565,11 @@ void hover_deadthink (edict_t *self)
 
 void hover_dead (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (self->mins, -16, -16, -24);
 	VectorSet (self->maxs, 16, 16, -8);
 	self->movetype = MOVETYPE_TOSS;
@@ -523,6 +583,11 @@ void hover_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damage
 {
 	int		n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	// check for gib
 	if (self->health <= self->gib_health)
 	{
@@ -558,6 +623,12 @@ void hover_dodge (edict_t *self, edict_t *attacker, float eta)
 	vec3_t forward, right;
 	vec3_t dir;
 	int count  = 0;
+
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.currentmove == &hover_move_attack1)
 		if (random() < 0.75) // if we're attacking, stop attacking and dodge 1/4 the time
 			return;
@@ -611,6 +682,11 @@ void SP_monster_hover_precache(void)
 */
 void SP_monster_hover (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);

src/monster/infantry/infantry.c

@@ -55,6 +55,11 @@ mmove_t infantry_move_stand = {FRAME_stand50, FRAME_stand71, infantry_frames_sta
 
 void infantry_stand (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &infantry_move_stand;
 }
 
@@ -115,6 +120,11 @@ mmove_t infantry_move_fidget = {FRAME_stand01, FRAME_stand49, infantry_frames_fi
 
 void infantry_fidget (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &infantry_move_fidget;
 	gi.sound (self, CHAN_VOICE, sound_idle, 1, ATTN_IDLE, 0);
 }
@@ -138,6 +148,11 @@ mmove_t infantry_move_walk = {FRAME_walk03, FRAME_walk14, infantry_frames_walk,
 
 void infantry_walk (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &infantry_move_walk;
 }
 
@@ -156,6 +171,11 @@ mmove_t infantry_move_run = {FRAME_run01, FRAME_run08, infantry_frames_run, NULL
 
 void infantry_run (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
 		self->monsterinfo.currentmove = &infantry_move_stand;
 	else
@@ -197,6 +217,11 @@ void infantry_pain (edict_t *self, edict_t *other, float kick, int damage)
 {
 	int		n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->health < (self->max_health / 2))
 		self->s.skinnum = 1;
 
@@ -245,6 +270,11 @@ void InfantryMachineGun (edict_t *self)
 	vec3_t	vec;
 	int		flash_number;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->s.frame == FRAME_attak111)
 	{
 		flash_number = MZ2_INFANTRY_MACHINEGUN_1;
@@ -285,11 +315,21 @@ void InfantryMachineGun (edict_t *self)
 
 void infantry_sight (edict_t *self, edict_t *other)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_BODY, sound_sight, 1, ATTN_NORM, 0);
 }
 
 void infantry_dead (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (self->mins, -16, -16, -24);
 	VectorSet (self->maxs, 16, 16, -8);
 	self->movetype = MOVETYPE_TOSS;
@@ -374,6 +414,11 @@ void infantry_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int dam
 {
 	int		n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	// check for gib
 	if (self->health <= self->gib_health)
 	{
@@ -416,6 +461,11 @@ void infantry_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int dam
 
 void infantry_duck_down (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_DUCKED)
 		return;
 	self->monsterinfo.aiflags |= AI_DUCKED;
@@ -427,6 +477,11 @@ void infantry_duck_down (edict_t *self)
 
 void infantry_duck_hold (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (level.time >= self->monsterinfo.pausetime)
 		self->monsterinfo.aiflags &= ~AI_HOLD_FRAME;
 	else
@@ -435,6 +490,11 @@ void infantry_duck_hold (edict_t *self)
 
 void infantry_duck_up (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.aiflags &= ~AI_DUCKED;
 	self->maxs[2] += 32;
 	self->takedamage = DAMAGE_AIM;
@@ -453,6 +513,11 @@ mmove_t infantry_move_duck = {FRAME_duck01, FRAME_duck05, infantry_frames_duck,
 
 void infantry_dodge (edict_t *self, edict_t *attacker, float eta)
 {
+	if (!self || !attacker)
+	{
+		return;
+	}
+
 	if (random() > 0.25)
 		return;
 
@@ -467,6 +532,11 @@ void infantry_cock_gun (edict_t *self)
 {
 	int		n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_WEAPON, sound_weapon_cock, 1, ATTN_NORM, 0);
 	n = (rand() & 15) + 3 + 7;
 	self->monsterinfo.pausetime = level.time + n * FRAMETIME;
@@ -474,6 +544,11 @@ void infantry_cock_gun (edict_t *self)
 
 void infantry_fire (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	InfantryMachineGun (self);
 
 	if (level.time >= self->monsterinfo.pausetime)
@@ -505,6 +580,11 @@ mmove_t infantry_move_attack1 = {FRAME_attak101, FRAME_attak115, infantry_frames
 
 void infantry_swing (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_WEAPON, sound_punch_swing, 1, ATTN_NORM, 0);
 }
 
@@ -512,6 +592,11 @@ void infantry_smack (edict_t *self)
 {
 	vec3_t	aim;
 
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (aim, MELEE_DISTANCE, 0, 0);
 	if (fire_hit (self, aim, (5 + (rand() % 5)), 50))
 		gi.sound (self, CHAN_WEAPON, sound_punch_hit, 1, ATTN_NORM, 0);
@@ -532,6 +617,11 @@ mmove_t infantry_move_attack2 = {FRAME_attak201, FRAME_attak208, infantry_frames
 
 void infantry_attack(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (range (self, self->enemy) == RANGE_MELEE)
 		self->monsterinfo.currentmove = &infantry_move_attack2;
 	else
@@ -543,6 +633,11 @@ void infantry_attack(edict_t *self)
 */
 void SP_monster_infantry (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);
@@ -597,6 +692,11 @@ void SP_monster_infantry (edict_t *self)
 
 void handler_ConvertToInfantry(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->s.modelindex = gi.modelindex("models/monsters/infantry/tris.md2");
 	VectorSet (self->mins, -16, -16, -24);
 	VectorSet (self->maxs, 16, 16, 32);

src/monster/insane/insane.c

@@ -17,21 +17,41 @@ static int	sound_scream[8];
 
 void insane_fist (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_fist, 1, ATTN_IDLE, 0);
 }
 
 void insane_shake (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_shake, 1, ATTN_IDLE, 0);
 }
 
 void insane_moan (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_moan, 1, ATTN_IDLE, 0);
 }
 
 void insane_scream (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_scream[rand()%8], 1, ATTN_IDLE, 0);
 }
 
@@ -414,6 +434,11 @@ mmove_t insane_move_struggle_cross = {FRAME_cross16, FRAME_cross30, insane_frame
 
 void insane_cross (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (random() < 0.8)
 		self->monsterinfo.currentmove = &insane_move_cross;
 	else
@@ -422,6 +447,11 @@ void insane_cross (edict_t *self)
 
 void insane_walk (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if ( self->spawnflags & 16 )			// Hold Ground?
 		if (self->s.frame == FRAME_cr_pain10)
 		{
@@ -439,6 +469,11 @@ void insane_walk (edict_t *self)
 
 void insane_run (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if ( self->spawnflags & 16 )			// Hold Ground?
 		if (self->s.frame == FRAME_cr_pain10)
 		{
@@ -459,6 +494,11 @@ void insane_pain (edict_t *self, edict_t *other, float kick, int damage)
 {
 	int	l,r;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (level.time < self->pain_debounce_time)
 		return;
 
@@ -496,11 +536,21 @@ void insane_pain (edict_t *self, edict_t *other, float kick, int damage)
 
 void insane_onground (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &insane_move_down;
 }
 
 void insane_checkdown (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->spawnflags & 32)				// Always stand
 		return;
 	if (random() < 0.3)
@@ -514,6 +564,11 @@ void insane_checkdown (edict_t *self)
 
 void insane_checkup (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	// If Hold_Ground and Crawl are set
 	if ( (self->spawnflags & 4) && (self->spawnflags & 16) )
 		return;
@@ -524,6 +579,11 @@ void insane_checkup (edict_t *self)
 
 void insane_stand (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->spawnflags & 8)			// If crucified
 	{
 		self->monsterinfo.currentmove = &insane_move_cross;
@@ -541,6 +601,11 @@ void insane_stand (edict_t *self)
 
 void insane_dead (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->spawnflags & 8)
 	{
 		self->flags |= FL_FLY;
@@ -561,6 +626,11 @@ void insane_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damag
 {
 	int		n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->health <= self->gib_health)
 	{
 		gi.sound (self, CHAN_VOICE, gi.soundindex ("misc/udeath.wav"), 1, ATTN_IDLE, 0);
@@ -599,6 +669,11 @@ void insane_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damag
 */
 void SP_misc_insane (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);

src/monster/medic/medic.c

@@ -29,6 +29,11 @@ edict_t *medic_FindDeadMonster (edict_t *self)
 	edict_t	*ent = NULL;
 	edict_t	*best = NULL;
 
+	if (!self)
+	{
+		return NULL;
+	}
+
 	while ((ent = findradius(ent, self->s.origin, 1024)) != NULL)
 	{
 		if (ent == self)
@@ -62,6 +67,11 @@ void medic_idle (edict_t *self)
 {
 	edict_t	*ent;
 
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_idle1, 1, ATTN_IDLE, 0);
 
 	ent = medic_FindDeadMonster(self);
@@ -78,6 +88,11 @@ void medic_search (edict_t *self)
 {
 	edict_t	*ent;
 
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_search, 1, ATTN_IDLE, 0);
 
 	if (!self->oldenemy)
@@ -96,6 +111,11 @@ void medic_search (edict_t *self)
 
 void medic_sight (edict_t *self, edict_t *other)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_sight, 1, ATTN_NORM, 0);
 }
 
@@ -198,6 +218,11 @@ mmove_t medic_move_stand = {FRAME_wait1, FRAME_wait90, medic_frames_stand, NULL}
 
 void medic_stand (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &medic_move_stand;
 }
 
@@ -221,6 +246,11 @@ mmove_t medic_move_walk = {FRAME_walk1, FRAME_walk12, medic_frames_walk, NULL};
 
 void medic_walk (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &medic_move_walk;
 }
 
@@ -239,6 +269,11 @@ mmove_t medic_move_run = {FRAME_run1, FRAME_run6, medic_frames_run, NULL};
 
 void medic_run (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!(self->monsterinfo.aiflags & AI_MEDIC))
 	{
 		edict_t	*ent;
@@ -297,6 +332,11 @@ mmove_t medic_move_pain2 = {FRAME_painb1, FRAME_painb15, medic_frames_pain2, med
 
 void medic_pain (edict_t *self, edict_t *other, float kick, int damage)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->health < (self->max_health / 2))
 		self->s.skinnum = 1;
 
@@ -328,6 +368,11 @@ void medic_fire_blaster (edict_t *self)
 	vec3_t	dir;
 	int		effect;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if ((self->s.frame == FRAME_attack9) || (self->s.frame == FRAME_attack12))
 		effect = EF_BLASTER;
 	else if ((self->s.frame == FRAME_attack19) || (self->s.frame == FRAME_attack22) || (self->s.frame == FRAME_attack25) || (self->s.frame == FRAME_attack28))
@@ -348,6 +393,11 @@ void medic_fire_blaster (edict_t *self)
 
 void medic_dead (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (self->mins, -16, -16, -24);
 	VectorSet (self->maxs, 16, 16, -8);
 	self->movetype = MOVETYPE_TOSS;
@@ -395,6 +445,11 @@ void medic_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damage
 {
 	int		n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	// if we had a pending patient, free him up for another medic
 	if ((self->enemy) && (self->enemy->owner == self))
 		self->enemy->owner = NULL;
@@ -426,6 +481,11 @@ void medic_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damage
 
 void medic_duck_down (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_DUCKED)
 		return;
 	self->monsterinfo.aiflags |= AI_DUCKED;
@@ -437,6 +497,11 @@ void medic_duck_down (edict_t *self)
 
 void medic_duck_hold (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (level.time >= self->monsterinfo.pausetime)
 		self->monsterinfo.aiflags &= ~AI_HOLD_FRAME;
 	else
@@ -445,6 +510,11 @@ void medic_duck_hold (edict_t *self)
 
 void medic_duck_up (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.aiflags &= ~AI_DUCKED;
 	self->maxs[2] += 32;
 	self->takedamage = DAMAGE_AIM;
@@ -474,6 +544,11 @@ mmove_t medic_move_duck = {FRAME_duck1, FRAME_duck16, medic_frames_duck, medic_r
 
 void medic_dodge (edict_t *self, edict_t *attacker, float eta)
 {
+	if (!self || !attacker)
+	{
+		return;
+	}
+
 	if (random() > 0.25)
 		return;
 
@@ -507,6 +582,11 @@ mmove_t medic_move_attackHyperBlaster = {FRAME_attack15, FRAME_attack30, medic_f
 
 void medic_continue (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (visible (self, self->enemy) )
 		if (random() <= 0.95)
 			self->monsterinfo.currentmove = &medic_move_attackHyperBlaster;
@@ -535,6 +615,11 @@ mmove_t medic_move_attackBlaster = {FRAME_attack1, FRAME_attack14, medic_frames_
 
 void medic_hook_launch (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_WEAPON, sound_hook_launch, 1, ATTN_NORM, 0);
 }
 
@@ -561,6 +646,11 @@ void medic_cable_attack (edict_t *self)
 	vec3_t	dir, angles;
 	float	distance;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (!self->enemy->inuse)
 		return;
 
@@ -636,6 +726,11 @@ void medic_cable_attack (edict_t *self)
 
 void medic_hook_retract (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_WEAPON, sound_hook_retract, 1, ATTN_NORM, 0);
 	self->enemy->monsterinfo.aiflags &= ~AI_RESURRECTING;
 }
@@ -676,6 +771,11 @@ mmove_t medic_move_attackCable = {FRAME_attack33, FRAME_attack60, medic_frames_a
 
 void medic_attack(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_MEDIC)
 		self->monsterinfo.currentmove = &medic_move_attackCable;
 	else
@@ -684,6 +784,11 @@ void medic_attack(edict_t *self)
 
 qboolean medic_checkattack (edict_t *self)
 {
+	if (!self)
+	{
+		return false;
+	}
+
 	if (self->monsterinfo.aiflags & AI_MEDIC)
 	{
 		medic_attack(self);
@@ -698,6 +803,11 @@ qboolean medic_checkattack (edict_t *self)
 */
 void SP_monster_medic (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);

src/monster/misc/move.c

@@ -22,6 +22,11 @@ qboolean M_CheckBottom (edict_t *ent)
 	int		x, y;
 	float	mid, bottom;
 
+	if (!ent)
+	{
+		return false;
+	}
+
 	VectorAdd (ent->s.origin, ent->mins, mins);
 	VectorAdd (ent->s.origin, ent->maxs, maxs);
 
@@ -100,6 +105,11 @@ qboolean SV_movestep (edict_t *ent, vec3_t move, qboolean relink)
 	vec3_t		test;
 	int			contents;
 
+	if (!ent)
+	{
+		return false;
+	}
+
 	// try the move	
 	VectorCopy (ent->s.origin, oldorg);
 	VectorAdd (ent->s.origin, move, neworg);
@@ -311,6 +321,11 @@ void M_ChangeYaw (edict_t *ent)
 	float	move;
 	float	speed;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	current = anglemod(ent->s.angles[YAW]);
 	ideal = ent->ideal_yaw;
 
@@ -358,6 +373,11 @@ qboolean SV_StepDirection (edict_t *ent, float yaw, float dist)
 	vec3_t		move, oldorigin;
 	float		delta;
 
+	if (!ent)
+	{
+		return false;
+	}
+
 	ent->ideal_yaw = yaw;
 	M_ChangeYaw (ent);
 
@@ -391,6 +411,11 @@ SV_FixCheckBottom
 */
 void SV_FixCheckBottom (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->flags |= FL_PARTIALGROUND;
 }
 
@@ -409,6 +434,11 @@ void SV_NewChaseDir (edict_t *actor, edict_t *enemy, float dist)
 	float	d[3];
 	float	tdir, olddir, turnaround;
 
+	if (!actor || !enemy)
+	{
+		return;
+	}
+
 	//FIXME: how did we get here with no enemy
 	if (!enemy)
 		return;
@@ -499,6 +529,11 @@ qboolean SV_CloseEnough (edict_t *ent, edict_t *goal, float dist)
 {
 	int		i;
 
+	if (!ent || !goal)
+	{
+		return false;
+	}
+
 	for (i=0 ; i<3 ; i++)
 	{
 		if (goal->absmin[i] > ent->absmax[i] + dist)
@@ -519,6 +554,11 @@ void M_MoveToGoal (edict_t *ent, float dist)
 {
 	edict_t		*goal;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	goal = ent->goalentity;
 
 	if (!ent->groundentity && !(ent->flags & (FL_FLY|FL_SWIM)))
@@ -546,6 +586,11 @@ qboolean M_walkmove (edict_t *ent, float yaw, float dist)
 {
 	vec3_t	move;
 
+	if (!ent)
+	{
+		return false;
+	}
+
 	if (!ent->groundentity && !(ent->flags & (FL_FLY|FL_SWIM)))
 		return false;
 
@@ -571,6 +616,11 @@ qboolean M_MoveAwayFromFlare(edict_t *self, float dist)
 	vec3_t delta;
 	vec3_t forward;
 
+	if (!self)
+	{
+		return false;
+	}
+
 	// find the closest flare
 	while(1)
 	{

src/monster/mutant/mutant.c

@@ -30,6 +30,11 @@ static int	sound_thud;
 
 void mutant_step (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	int		n;
 	n = (rand() + 1) % 3;
 	if (n == 0)
@@ -42,16 +47,31 @@ void mutant_step (edict_t *self)
 
 void mutant_sight (edict_t *self, edict_t *other)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_sight, 1, ATTN_NORM, 0);
 }
 
 void mutant_search (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_search, 1, ATTN_NORM, 0);
 }
 
 void mutant_swing (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_swing, 1, ATTN_NORM, 0);
 }
 
@@ -123,6 +143,11 @@ mmove_t mutant_move_stand = {FRAME_stand101, FRAME_stand151, mutant_frames_stand
 
 void mutant_stand (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &mutant_move_stand;
 }
 
@@ -133,6 +158,11 @@ void mutant_stand (edict_t *self)
 
 void mutant_idle_loop (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (random() < 0.75)
 		self->monsterinfo.nextframe = FRAME_stand155;
 }
@@ -157,6 +187,11 @@ mmove_t mutant_move_idle = {FRAME_stand152, FRAME_stand164, mutant_frames_idle,
 
 void mutant_idle (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &mutant_move_idle;
 	gi.sound (self, CHAN_VOICE, sound_idle, 1, ATTN_IDLE, 0);
 }
@@ -187,6 +222,11 @@ mmove_t mutant_move_walk = {FRAME_walk05, FRAME_walk16, mutant_frames_walk, NULL
 
 void mutant_walk_loop (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &mutant_move_walk;
 }
 
@@ -201,6 +241,11 @@ mmove_t mutant_move_start_walk = {FRAME_walk01, FRAME_walk04, mutant_frames_star
 
 void mutant_walk (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &mutant_move_start_walk;
 }
 
@@ -222,6 +267,11 @@ mmove_t mutant_move_run = {FRAME_run03, FRAME_run08, mutant_frames_run, NULL};
 
 void mutant_run (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
 		self->monsterinfo.currentmove = &mutant_move_stand;
 	else
@@ -235,6 +285,11 @@ void mutant_run (edict_t *self)
 
 void mutant_hit_left (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	vec3_t	aim;
 
 	VectorSet (aim, MELEE_DISTANCE, self->mins[0], 8);
@@ -246,6 +301,11 @@ void mutant_hit_left (edict_t *self)
 
 void mutant_hit_right (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	vec3_t	aim;
 
 	VectorSet (aim, MELEE_DISTANCE, self->maxs[0], 8);
@@ -257,6 +317,11 @@ void mutant_hit_right (edict_t *self)
 
 void mutant_check_refire (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!self->enemy || !self->enemy->inuse || self->enemy->health <= 0)
 		return;
 
@@ -278,6 +343,11 @@ mmove_t mutant_move_attack = {FRAME_attack09, FRAME_attack15, mutant_frames_atta
 
 void mutant_melee (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &mutant_move_attack;
 }
 
@@ -288,6 +358,11 @@ void mutant_melee (edict_t *self)
 
 void mutant_jump_touch (edict_t *self, edict_t *other, cplane_t *plane, csurface_t *surf)
 {
+	if (!self || !other)
+	{
+		return;
+	}
+
 	if (self->health <= 0)
 	{
 		self->touch = NULL;
@@ -327,6 +402,11 @@ void mutant_jump_takeoff (edict_t *self)
 {
 	vec3_t	forward;
 
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_sight, 1, ATTN_NORM, 0);
 	AngleVectors (self->s.angles, forward, NULL, NULL);
 	self->s.origin[2] += 1;
@@ -340,6 +420,11 @@ void mutant_jump_takeoff (edict_t *self)
 
 void mutant_check_landing (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->groundentity)
 	{
 		gi.sound (self, CHAN_WEAPON, sound_thud, 1, ATTN_NORM, 0);
@@ -369,6 +454,11 @@ mmove_t mutant_move_jump = {FRAME_attack01, FRAME_attack08, mutant_frames_jump,
 
 void mutant_jump (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &mutant_move_jump;
 }
 
@@ -379,6 +469,11 @@ void mutant_jump (edict_t *self)
 
 qboolean mutant_check_melee (edict_t *self)
 {
+	if (!self)
+	{
+		return false;
+	}
+
 	if (range (self, self->enemy) == RANGE_MELEE)
 		return true;
 	return false;
@@ -389,6 +484,11 @@ qboolean mutant_check_jump (edict_t *self)
 	vec3_t	v;
 	float	distance;
 
+	if (!self)
+	{
+		return false;
+	}
+
 	if (self->absmin[2] > (self->enemy->absmin[2] + 0.75 * self->enemy->size[2]))
 		return false;
 
@@ -413,6 +513,11 @@ qboolean mutant_check_jump (edict_t *self)
 
 qboolean mutant_checkattack (edict_t *self)
 {
+	if (!self)
+	{
+		return false;
+	}
+
 	if (!self->enemy || self->enemy->health <= 0)
 		return false;
 
@@ -514,6 +619,11 @@ void mutant_pain (edict_t *self, edict_t *other, float kick, int damage)
 
 void mutant_dead (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (self->mins, -16, -16, -24);
 	VectorSet (self->maxs, 16, 16, -8);
 	self->movetype = MOVETYPE_TOSS;
@@ -556,6 +666,11 @@ void mutant_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damag
 {
 	int		n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->health <= self->gib_health)
 	{
 		gi.sound (self, CHAN_VOICE, gi.soundindex ("misc/udeath.wav"), 1, ATTN_NORM, 0);
@@ -591,6 +706,11 @@ void mutant_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damag
 */
 void SP_monster_mutant (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);

src/monster/parasite/parasite.c

@@ -35,31 +35,61 @@ void parasite_refidget (edict_t *self);
 
 void parasite_launch (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_WEAPON, sound_launch, 1, ATTN_NORM, 0);
 }
 
 void parasite_reel_in (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_WEAPON, sound_reelin, 1, ATTN_NORM, 0);
 }
 
 void parasite_sight (edict_t *self, edict_t *other)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_WEAPON, sound_sight, 1, ATTN_NORM, 0);
 }
 
 void parasite_tap (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_WEAPON, sound_tap, 1, ATTN_IDLE, 0);
 }
 
 void parasite_scratch (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_WEAPON, sound_scratch, 1, ATTN_IDLE, 0);
 }
 
 void parasite_search (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_WEAPON, sound_search, 1, ATTN_IDLE, 0);
 }
 
@@ -99,16 +129,31 @@ mmove_t parasite_move_end_fidget = {FRAME_stand28, FRAME_stand35, parasite_frame
 
 void parasite_end_fidget (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &parasite_move_end_fidget;
 }
 
 void parasite_do_fidget (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &parasite_move_fidget;
 }
 
 void parasite_refidget (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (random() <= 0.8)
 		self->monsterinfo.currentmove = &parasite_move_fidget;
 	else
@@ -117,6 +162,11 @@ void parasite_refidget (edict_t *self)
 
 void parasite_idle (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &parasite_move_start_fidget;
 }
 
@@ -145,6 +195,11 @@ mmove_t	parasite_move_stand = {FRAME_stand01, FRAME_stand17, parasite_frames_sta
 
 void parasite_stand (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &parasite_move_stand;
 }
 
@@ -181,6 +236,11 @@ mmove_t parasite_move_stop_run = {FRAME_run10, FRAME_run15, parasite_frames_stop
 
 void parasite_start_run (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
 		self->monsterinfo.currentmove = &parasite_move_stand;
 	else
@@ -189,6 +249,11 @@ void parasite_start_run (edict_t *self)
 
 void parasite_run (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
 		self->monsterinfo.currentmove = &parasite_move_stand;
 	else
@@ -228,11 +293,21 @@ mmove_t parasite_move_stop_walk = {FRAME_run10, FRAME_run15, parasite_frames_sto
 
 void parasite_start_walk (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &parasite_move_start_walk;
 }
 
 void parasite_walk (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &parasite_move_walk;
 }
 
@@ -255,6 +330,11 @@ mmove_t parasite_move_pain1 = {FRAME_pain101, FRAME_pain111, parasite_frames_pai
 
 void parasite_pain (edict_t *self, edict_t *other, float kick, int damage)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->health < (self->max_health / 2))
 		self->s.skinnum = 1;
 
@@ -300,6 +380,11 @@ void parasite_drain_attack (edict_t *self)
 	trace_t	tr;
 	int damage;
 
+	if (!self)
+	{
+		return;
+	}
+
 	AngleVectors (self->s.angles, f, r, NULL);
 	VectorSet (offset, 24, 0, 6);
 	G_ProjectSource (self->s.origin, offset, f, r, start);
@@ -413,6 +498,11 @@ Break Stuff Ends
 
 void parasite_attack (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &parasite_move_drain;
 }
 
@@ -426,6 +516,11 @@ Death Stuff Starts
 
 void parasite_dead (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (self->mins, -16, -16, -24);
 	VectorSet (self->maxs, 16, 16, -8);
 	self->movetype = MOVETYPE_TOSS;
@@ -450,6 +545,11 @@ void parasite_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int dam
 {
 	int		n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	// check for gib
 	if (self->health <= self->gib_health)
 	{
@@ -483,6 +583,11 @@ End Death Stuff
 */
 void SP_monster_parasite (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);

src/monster/sentien/sentien.c

@@ -27,66 +27,131 @@ static int sound_att3;
 
 void sentien_sound_footstep(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound(self, CHAN_BODY, sound_walk, 1, ATTN_NORM, 0);
 }
 
 void sentien_sound_idle1(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound(self, CHAN_BODY, sound_idle1, 1, ATTN_NORM, 0);
 }
 
 void sentien_sound_idle2(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound(self, CHAN_BODY, sound_idle2, 1, ATTN_NORM, 0);
 }
 
 void sentien_sound_idle3(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound(self, CHAN_BODY, sound_idle3, 1, ATTN_NORM, 0);
 }
 
 void sentian_sound_att1(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound(self, CHAN_BODY, sound_att1, 1, ATTN_NORM, 0);
 }
 
 void sentian_sound_att2(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound(self, CHAN_BODY, sound_att2, 1, ATTN_NORM, 0);
 }
 
 void sentian_sound_att3(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound(self, CHAN_BODY, sound_att3, 1, ATTN_NORM, 0);
 }
 
 void sentian_sound_fend(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound(self, CHAN_BODY, sound_fend, 1, ATTN_NORM, 0);
 }
 
 void sentian_sound_pain1(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound(self, CHAN_BODY, sound_pain1, 1, ATTN_NORM, 0);
 }
 
 void sentian_sound_pain2(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound(self, CHAN_BODY, sound_pain2, 1, ATTN_NORM, 0);
 }
 
 void sentian_sound_pain3(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound(self, CHAN_BODY, sound_pain3, 1, ATTN_NORM, 0);
 }
 
 void sentian_sound_die1(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound(self, CHAN_BODY, sound_die1, 1, ATTN_NORM, 0);
 }
 
 void sentian_sound_die2(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound(self, CHAN_BODY, sound_die2, 1, ATTN_NORM, 0);
 }
 
@@ -202,6 +267,11 @@ mmove_t   sentien_move_stand3 = {FRAME_stand3start, FRAME_stand3end,
 
 void sentien_stand(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	target_laser_off(self->laser);
 
 	self->monsterinfo.currentmove = &sentien_move_stand1;
@@ -212,6 +282,11 @@ void sentien_stand_whatnow(edict_t *self)
 	float r;
 	r = random();
 
+	if (!self)
+	{
+		return;
+	}
+
 	if(r < self->random)
 	{
 		self->monsterinfo.currentmove = &sentien_move_stand1;
@@ -231,6 +306,11 @@ void sentien_stand_whatnow(edict_t *self)
 
 void sentien_stand_earwax(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if(random() > 0.80)
 	{
 		//more ear wax damn it, try again
@@ -301,6 +381,11 @@ mmove_t   sentien_move_walk_end = {FRAME_walkEndStart, FRAME_walkEndEnd,
 
 void sentien_walk(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	target_laser_off(self->laser);
 
 	if(self->monsterinfo.currentmove == &sentien_move_walk)
@@ -380,6 +465,11 @@ mmove_t   sentien_move_run_end = {FRAME_walkEndStart, FRAME_walkEndEnd,
 
 void sentien_run(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	target_laser_off(self->laser);
 
 	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
@@ -448,6 +538,11 @@ mmove_t   sentien_move_post_blast_attack = {   FRAME_blastPostStart, FRAME_blast
 
 void sentien_blast_attack(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	target_laser_off(self->laser);
 
 	self->monsterinfo.currentmove = &sentien_move_blast_attack;
@@ -466,6 +561,11 @@ void sentien_post_blast_attack(edict_t *self)
 {
 	float refire = 0.25;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (visible(self, self->enemy) &&
 		infront(self, self->enemy))
 	{
@@ -485,6 +585,11 @@ void sentien_post_blast_attack(edict_t *self)
 
 void sentien_fire_bullet (edict_t *self, vec3_t start, vec3_t dir, int damage)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if(EMPNukeCheck(self, self->s.origin))
 	{
 		gi.sound (self, CHAN_AUTO, gi.soundindex("items/empnuke/emp_missfire.wav"), 1, ATTN_NORM, 0);
@@ -519,6 +624,11 @@ void sentien_do_blast(edict_t *self)
 	vec3_t   end;
 	int      idx;
 
+	if (!self)
+	{
+		return;
+	}
+
 	idx = self->s.frame - FRAME_blastStart + 1;
 
 	AngleVectors (self->s.angles, forward, right, NULL);
@@ -597,6 +707,11 @@ mmove_t   sentien_move_post_laser_attack = {   FRAME_laserPostStart, FRAME_laser
 
 void sentien_laser_attack(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	// is a player right infront?
 	if (visible(self, self->enemy) &&
 		infront(self, self->enemy))
@@ -686,11 +801,15 @@ void sentien_do_laser(edict_t *self)
 
 void sentien_attack(edict_t *self)
 {
-
 	vec3_t	vec;
 	float	range;
 	float	r;
 
+	if (!self)
+	{
+		return;
+	}
+
 	target_laser_off(self->laser);
 
 	//sentien_run(self); // to test walking
@@ -726,6 +845,11 @@ void sentien_attack(edict_t *self)
 
 void sentien_fend_ready (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_REDUCEDDAMAGE)
 		return;
 	self->monsterinfo.pausetime = level.time + 1;
@@ -733,6 +857,11 @@ void sentien_fend_ready (edict_t *self)
 
 void sentien_fend_hold (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (level.time >= self->monsterinfo.pausetime)
 	{
 		self->monsterinfo.aiflags &= ~AI_HOLD_FRAME;
@@ -767,6 +896,11 @@ mmove_t sentien_move_fend = {FRAME_dodgeStart, FRAME_dodgeEnd, sentien_frames_fe
 
 void sentien_fend (edict_t *self, edict_t *attacker, float eta)
 {
+	if (!self || !attacker)
+	{
+		return;
+	}
+
 	// don't flinch if attacking
 	if(self->monsterinfo.currentmove == &sentien_move_laser_attack ||
 			self->monsterinfo.currentmove == &sentien_move_blast_attack)
@@ -852,6 +986,11 @@ void sentien_pain (edict_t *self, edict_t *other, float kick, int damage)
 {
 	float r;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if((self->health < (self->max_health / 2)))
 		self->s.skinnum |= 1;
 
@@ -868,9 +1007,6 @@ void sentien_pain (edict_t *self, edict_t *other, float kick, int damage)
 	else if(r < 0.66)
 	{
 		sentian_sound_pain2(self);
-  }
-  else
-  {
 	}
 
 	if (level.time < self->pain_debounce_time)
@@ -996,6 +1132,11 @@ void sentien_dead(edict_t *self)
 	vec3_t   start, end, point;
 	vec3_t   forward, right;
 
+	if (!self)
+	{
+		return;
+	}
+
 	AngleVectors (self->s.angles, forward, right, NULL);
 	G_ProjectSource (self->s.origin, sentien_death_offset[0],
 		forward, right, point);
@@ -1018,6 +1159,11 @@ void sentien_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int dama
 {
 	int n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	target_laser_off(self->laser);
 
 	//gib code to go here
@@ -1056,6 +1202,11 @@ void create_sentien_laser(edict_t *self)
 	vec3_t start;
 	vec3_t forward, right;
 
+	if (!self)
+	{
+		return;
+	}
+
 	self->laser = G_Spawn();
 	self->laser->movetype = MOVETYPE_NONE;
 	self->laser->solid = SOLID_BBOX;//SOLID_NOT;
@@ -1084,7 +1235,6 @@ void create_sentien_laser(edict_t *self)
 
 void SP_monster_sentien_precache(void)
 {
-
 	sound_idle1 = gi.soundindex("monsters/sentien/sen_idle1.wav");
 	sound_idle2 = gi.soundindex("monsters/sentien/sen_idle2.wav");
 	sound_walk = gi.soundindex("monsters/sentien/sen_walk.wav");
@@ -1100,6 +1250,11 @@ void SP_monster_sentien_precache(void)
 
 void SP_monster_sentien(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	SP_monster_sentien_precache();
 
 	self->mass = 500;

src/monster/soldier/soldier.c

@@ -24,12 +24,22 @@ static int	sound_cock;
 
 void soldier_idle (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (random() > 0.8)
 		gi.sound (self, CHAN_VOICE, sound_idle, 1, ATTN_IDLE, 0);
 }
 
 void soldier_cock (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->s.frame == FRAME_stand322)
 		gi.sound (self, CHAN_WEAPON, sound_cock, 1, ATTN_IDLE, 0);
 	else
@@ -128,6 +138,11 @@ mmove_t soldier_move_stand3 = {FRAME_stand301, FRAME_stand339, soldier_frames_st
 
 void soldier_stand (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if ((self->monsterinfo.currentmove == &soldier_move_stand3) || (random() < 0.8))
 		self->monsterinfo.currentmove = &soldier_move_stand1;
 	else
@@ -141,6 +156,11 @@ void soldier_stand (edict_t *self)
 
 void soldier_walk1_random (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (random() > 0.1)
 		self->monsterinfo.nextframe = FRAME_walk101;
 }
@@ -200,6 +220,11 @@ mmove_t soldier_move_walk2 = {FRAME_walk209, FRAME_walk218, soldier_frames_walk2
 
 void soldier_walk (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (random() < 0.5)
 		self->monsterinfo.currentmove = &soldier_move_walk1;
 	else
@@ -233,6 +258,11 @@ mmove_t soldier_move_run = {FRAME_run03, FRAME_run08, soldier_frames_run, NULL};
 
 void soldier_run (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
 	{
 		self->monsterinfo.currentmove = &soldier_move_stand1;
@@ -329,6 +359,11 @@ void soldier_pain (edict_t *self, edict_t *other, float kick, int damage)
 	float	r;
 	int		n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->health < (self->max_health / 2))
 			self->s.skinnum |= 1;
 
@@ -387,6 +422,11 @@ void soldier_fire (edict_t *self, int flash_number)
 	float	r, u;
 	int		flash_index;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->s.skinnum < 2)
 		flash_index = blaster_flash[flash_number];
 	else if (self->s.skinnum < 4)
@@ -445,11 +485,21 @@ void soldier_fire (edict_t *self, int flash_number)
 
 void soldier_fire1 (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	soldier_fire (self, 0);
 }
 
 void soldier_attack1_refire1 (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->s.skinnum > 1)
 		return;
 
@@ -464,6 +514,11 @@ void soldier_attack1_refire1 (edict_t *self)
 
 void soldier_attack1_refire2 (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->s.skinnum < 2)
 		return;
 
@@ -495,11 +550,21 @@ mmove_t soldier_move_attack1 = {FRAME_attak101, FRAME_attak112, soldier_frames_a
 
 void soldier_fire2 (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	soldier_fire (self, 1);
 }
 
 void soldier_attack2_refire1 (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->s.skinnum > 1)
 		return;
 
@@ -514,6 +579,11 @@ void soldier_attack2_refire1 (edict_t *self)
 
 void soldier_attack2_refire2 (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->s.skinnum < 2)
 		return;
 
@@ -551,6 +621,11 @@ mmove_t soldier_move_attack2 = {FRAME_attak201, FRAME_attak218, soldier_frames_a
 
 void soldier_duck_down (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_DUCKED)
 		return;
 	self->monsterinfo.aiflags |= AI_DUCKED;
@@ -562,6 +637,11 @@ void soldier_duck_down (edict_t *self)
 
 void soldier_duck_up (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.aiflags &= ~AI_DUCKED;
 	self->maxs[2] += 32;
 	self->takedamage = DAMAGE_AIM;
@@ -570,12 +650,22 @@ void soldier_duck_up (edict_t *self)
 
 void soldier_fire3 (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	soldier_duck_down (self);
 	soldier_fire (self, 2);
 }
 
 void soldier_attack3_refire (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if ((level.time + 0.4) < self->monsterinfo.pausetime)
 		self->monsterinfo.nextframe = FRAME_attak303;
 }
@@ -598,6 +688,11 @@ mmove_t soldier_move_attack3 = {FRAME_attak301, FRAME_attak309, soldier_frames_a
 
 void soldier_fire4 (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	soldier_fire (self, 3);
 }
 
@@ -616,11 +711,21 @@ mmove_t soldier_move_attack4 = {FRAME_attak401, FRAME_attak406, soldier_frames_a
 
 void soldier_fire8 (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	soldier_fire (self, 7);
 }
 
 void soldier_attack6_refire (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->enemy->health <= 0)
 		return;
 
@@ -652,6 +757,11 @@ mmove_t soldier_move_attack6 = {FRAME_runs01, FRAME_runs14, soldier_frames_attac
 
 void soldier_attack(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->s.skinnum < 4)
 	{
 		if (random() < 0.5)
@@ -672,6 +782,11 @@ void soldier_attack(edict_t *self)
 
 void soldier_sight(edict_t *self, edict_t *other)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (random() < 0.5)
 		gi.sound (self, CHAN_VOICE, sound_sight1, 1, ATTN_NORM, 0);
 	else
@@ -690,6 +805,11 @@ void soldier_sight(edict_t *self, edict_t *other)
 
 void soldier_duck_hold (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (level.time >= self->monsterinfo.pausetime)
 		self->monsterinfo.aiflags &= ~AI_HOLD_FRAME;
 	else
@@ -710,6 +830,11 @@ void soldier_dodge (edict_t *self, edict_t *attacker, float eta)
 {
 	float	r;
 
+	if (!self || !attacker)
+	{
+		return;
+	}
+
 	r = random();
 	if (r > 0.25)
 		return;
@@ -754,16 +879,31 @@ void soldier_dodge (edict_t *self, edict_t *attacker, float eta)
 
 void soldier_fire6 (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	soldier_fire (self, 5);
 }
 
 void soldier_fire7 (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	soldier_fire (self, 6);
 }
 
 void soldier_dead (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (self->mins, -16, -16, -24);
 	VectorSet (self->maxs, 16, 16, -8);
 	self->movetype = MOVETYPE_TOSS;
@@ -1026,6 +1166,11 @@ void soldier_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int dama
 {
 	int		n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	// check for gib
 	if (self->health <= self->gib_health)
 	{
@@ -1080,6 +1225,10 @@ void soldier_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int dama
 
 void SP_monster_soldier_x (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
 
 	self->s.modelindex = gi.modelindex ("models/monsters/soldier/tris.md2");
 	self->monsterinfo.scale = MODEL_SCALE;
@@ -1118,6 +1267,11 @@ void SP_monster_soldier_x (edict_t *self)
 */
 void SP_monster_soldier_light (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);
@@ -1141,6 +1295,11 @@ void SP_monster_soldier_light (edict_t *self)
 */
 void SP_monster_soldier (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);
@@ -1162,6 +1321,11 @@ void SP_monster_soldier (edict_t *self)
 */
 void SP_monster_soldier_ss (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);

src/monster/supertank/supertank.c

@@ -24,11 +24,21 @@ void BossExplode (edict_t *self);
 
 void TreadSound (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, tread_sound, 1, ATTN_NORM, 0);
 }
 
 void supertank_search (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (random() < 0.5)
 		gi.sound (self, CHAN_VOICE, sound_search1, 1, ATTN_NORM, 0);
 	else
@@ -113,6 +123,11 @@ mmove_t	supertank_move_stand = {FRAME_stand_1, FRAME_stand_60, supertank_frames_
 
 void supertank_stand (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &supertank_move_stand;
 }
 
@@ -170,16 +185,31 @@ mmove_t	supertank_move_forward = {FRAME_forwrd_1, FRAME_forwrd_18, supertank_fra
 
 void supertank_forward (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &supertank_move_forward;
 }
 
 void supertank_walk (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &supertank_move_forward;
 }
 
 void supertank_run (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
 		self->monsterinfo.currentmove = &supertank_move_stand;
 	else
@@ -421,6 +451,11 @@ mmove_t supertank_move_end_attack1 = {FRAME_attak1_7, FRAME_attak1_20, supertank
 
 void supertank_reattack1(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (visible(self, self->enemy))
 		if (random() < 0.9)
 			self->monsterinfo.currentmove = &supertank_move_attack1;
@@ -432,6 +467,10 @@ void supertank_reattack1(edict_t *self)
 
 void supertank_pain (edict_t *self, edict_t *other, float kick, int damage)
 {
+	if (!self)
+	{
+		return;
+	}
 
 	if (self->health < (self->max_health / 2))
 			self->s.skinnum = 1;
@@ -480,6 +519,11 @@ void supertankRocket (edict_t *self)
 	vec3_t	vec;
 	int		flash_number;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->s.frame == FRAME_attak2_8)
 		flash_number = MZ2_SUPERTANK_ROCKET_1;
 	else if (self->s.frame == FRAME_attak2_11)
@@ -506,6 +550,11 @@ void supertankMachineGun (edict_t *self)
 	vec3_t	forward, right;
 	int		flash_number;
 
+	if (!self)
+	{
+		return;
+	}
+
 	flash_number = MZ2_SUPERTANK_MACHINEGUN_1 + (self->s.frame - FRAME_attak1_1);
 
 	//FIXME!!!
@@ -540,6 +589,11 @@ void supertank_attack(edict_t *self)
 	vec3_t	vec;
 	float	range;
 
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSubtract (self->enemy->s.origin, self->s.origin, vec);
 	range = VectorLength (vec);
 
@@ -563,6 +617,11 @@ void supertank_attack(edict_t *self)
 
 void supertank_dead (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (self->mins, -60, -60, 0);
 	VectorSet (self->maxs, 60, 60, 72);
 	self->movetype = MOVETYPE_TOSS;
@@ -577,6 +636,11 @@ void BossExplode (edict_t *self)
 	vec3_t	org;
 	int		n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	self->think = BossExplode;
 	VectorCopy (self->s.origin, org);
 	org[2] += 24 + (rand()&15);
@@ -637,6 +701,11 @@ void BossExplode (edict_t *self)
 
 void supertank_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damage, vec3_t point)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_death, 1, ATTN_NORM, 0);
 	self->deadflag = DEAD_DEAD;
 	self->takedamage = DAMAGE_NO;
@@ -652,6 +721,11 @@ void supertank_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int da
 */
 void SP_monster_supertank (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);

src/monster/tank/tank.c

@@ -29,27 +29,52 @@ static int	sound_strike;
 
 void tank_sight (edict_t *self, edict_t *other)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_sight, 1, ATTN_NORM, 0);
 }
 
 
 void tank_footstep (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_BODY, sound_step, 1, ATTN_NORM, 0);
 }
 
 void tank_thud (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_BODY, sound_thud, 1, ATTN_NORM, 0);
 }
 
 void tank_windup (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_WEAPON, sound_windup, 1, ATTN_NORM, 0);
 }
 
 void tank_idle (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_VOICE, sound_idle, 1, ATTN_IDLE, 0);
 }
 
@@ -95,6 +120,11 @@ mmove_t	tank_move_stand = {FRAME_stand01, FRAME_stand30, tank_frames_stand, NULL
 	
 void tank_stand (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &tank_move_stand;
 }
 
@@ -147,6 +177,11 @@ mmove_t	tank_move_stop_walk = {FRAME_walk21, FRAME_walk25, tank_frames_stop_walk
 
 void tank_walk (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &tank_move_walk;
 }
 
@@ -199,6 +234,11 @@ mmove_t	tank_move_stop_run = {FRAME_walk21, FRAME_walk25, tank_frames_stop_run,
 
 void tank_run (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->enemy && self->enemy->client)
 		self->monsterinfo.aiflags |= AI_BRUTAL;
 	else
@@ -268,6 +308,11 @@ mmove_t	tank_move_pain3 = {FRAME_pain301, FRAME_pain316, tank_frames_pain3, tank
 
 void tank_pain (edict_t *self, edict_t *other, float kick, int damage)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->health < (self->max_health / 2))
 		self->s.skinnum |= 1;
 
@@ -317,6 +362,11 @@ void TankBlaster (edict_t *self)
 	vec3_t	dir;
 	int		flash_number;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->s.frame == FRAME_attak110)
 		flash_number = MZ2_TANK_BLASTER_1;
 	else if (self->s.frame == FRAME_attak113)
@@ -336,6 +386,11 @@ void TankBlaster (edict_t *self)
 
 void TankStrike (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.sound (self, CHAN_WEAPON, sound_strike, 1, ATTN_NORM, 0);
 }
 
@@ -347,6 +402,11 @@ void TankRocket (edict_t *self)
 	vec3_t	vec;
 	int		flash_number;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->s.frame == FRAME_attak324)
 		flash_number = MZ2_TANK_ROCKET_1;
 	else if (self->s.frame == FRAME_attak327)
@@ -373,6 +433,11 @@ void TankMachineGun (edict_t *self)
 	vec3_t	forward, right;
 	int		flash_number;
 
+	if (!self)
+	{
+		return;
+	}
+
 	flash_number = MZ2_TANK_MACHINEGUN_1 + (self->s.frame - FRAME_attak406);
 
 	AngleVectors (self->s.angles, forward, right, NULL);
@@ -453,6 +518,11 @@ mmove_t tank_move_attack_post_blast = {FRAME_attak117, FRAME_attak122, tank_fram
 
 void tank_reattack_blaster (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (skill->value >= SKILL_HARD)
 		if (visible (self, self->enemy))
 			if (self->enemy->health > 0)
@@ -467,6 +537,11 @@ void tank_reattack_blaster (edict_t *self)
 
 void tank_poststrike (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->enemy = NULL;
 	tank_run (self);
 }
@@ -622,6 +697,11 @@ mmove_t tank_move_attack_chain = {FRAME_attak401, FRAME_attak429, tank_frames_at
 
 void tank_refire_rocket (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	// Only on hard or nightmare
 	if ( skill->value >= SKILL_HARD )
 		if (self->enemy->health > 0)
@@ -636,6 +716,11 @@ void tank_refire_rocket (edict_t *self)
 
 void tank_doattack_rocket (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->monsterinfo.currentmove = &tank_move_attack_fire_rocket;
 }
 
@@ -645,6 +730,11 @@ void tank_attack(edict_t *self)
 	float	range;
 	float	r;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->enemy->health < 0)
 	{
 		self->monsterinfo.currentmove = &tank_move_attack_strike;
@@ -692,6 +782,11 @@ void tank_attack(edict_t *self)
 
 void tank_dead (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSet (self->mins, -16, -16, -16);
 	VectorSet (self->maxs, 16, 16, -0);
 	self->movetype = MOVETYPE_TOSS;
@@ -741,6 +836,11 @@ void tank_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damage,
 {
 	int		n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	// check for gib
 	if (self->health <= self->gib_health)
 	{
@@ -778,6 +878,11 @@ void tank_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damage,
 */
 void SP_monster_tank (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict (self);

src/player/client.c

@@ -23,6 +23,11 @@ void SP_FixCoopSpots (edict_t *self)
 	edict_t	*spot;
 	vec3_t	d;
 
+	if (!self)
+	{
+		return;
+	}
+
 	spot = NULL;
 
 	while(1)
@@ -59,6 +64,11 @@ The normal starting point for a level.
 */
 void SP_info_player_start(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!coop->value)
 		return;
 	if(Q_stricmp(level.mapname, "security") == 0)
@@ -74,6 +84,11 @@ potential spawning position for deathmatch games
 */
 void SP_info_player_deathmatch(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!deathmatch->value)
 	{
 		G_FreeEdict (self);
@@ -88,6 +103,11 @@ potential spawning position for coop games
 
 void SP_info_player_coop(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (!coop->value)
 	{
 		G_FreeEdict (self);
@@ -130,6 +150,11 @@ void SP_info_player_intermission(void)
 void stopCamera(edict_t *ent);
 void player_pain (edict_t *self, edict_t *other, float kick, int damage)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	// player pain is handled at the end of the frame in P_DamageFeedback
 	// if we're in a camera, get out
 	if (self->client->zCameraTrack)
@@ -143,6 +168,11 @@ qboolean IsFemale (edict_t *ent)
 {
 	char		*info;
 
+	if (!ent)
+	{
+		return false;
+	}
+
 	if (!ent->client)
 		return false;
 
@@ -192,6 +222,11 @@ void ClientObituary (edict_t *self, edict_t *inflictor, edict_t *attacker)
 	char		*message2;
 	qboolean	ff;
 
+	if (!self || !attacker)
+	{
+		return;
+	}
+
 	if (coop->value && attacker->client)
 		meansOfDeath |= MOD_FRIENDLY_FIRE;
 
@@ -436,6 +471,11 @@ void TossClientWeapon (edict_t *self)
 	qboolean	quad;
 	float		spread;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (!deathmatch->value)
 		return;
 
@@ -486,6 +526,11 @@ void LookAtKiller (edict_t *self, edict_t *inflictor, edict_t *attacker)
 {
 	vec3_t		dir;
 
+	if (!self || !inflictor || !attacker)
+	{
+		return;
+	}
+
 	if (attacker && attacker != world && attacker != self)
 	{
 		VectorSubtract (attacker->s.origin, self->s.origin, dir);
@@ -515,6 +560,10 @@ void player_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damag
 {
 	int		n;
 
+	if (!self || !inflictor || !attacker)
+	{
+		return;
+	}
 
 	// if we're in a camera, get out
 	if (self->client->zCameraTrack)
@@ -621,6 +670,11 @@ void InitClientPersistant (gclient_t *client)
 {
 	gitem_t		*item;
 
+	if (!client)
+	{
+		return;
+	}
+
 	memset (&client->pers, 0, sizeof(client->pers));
 
 	item = FindItem("Push");
@@ -662,6 +716,11 @@ void InitClientPersistant (gclient_t *client)
 
 void InitClientResp (gclient_t *client)
 {
+	if (!client)
+	{
+		return;
+	}
+
 	memset (&client->resp, 0, sizeof(client->resp));
 	client->resp.enterframe = level.framenum;
 	client->resp.coop_respawn = client->pers;
@@ -697,6 +756,11 @@ void SaveClientData (void)
 
 void FetchClientEntData (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->health = ent->client->pers.health;
 	ent->max_health = ent->client->pers.max_health;
 	if (ent->client->pers.powerArmorActive)
@@ -730,6 +794,11 @@ float	PlayersRangeFromSpot (edict_t *spot)
 	int		n;
 	float	playerdistance;
 
+	if (!spot)
+	{
+		return 0.0;
+	}
+
 
 	bestplayerdistance = 9999999;
 
@@ -1015,6 +1084,11 @@ void body_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damage,
 {
 	int	n;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->health < -40)
 	{
 		gi.sound (self, CHAN_BODY, gi.soundindex ("misc/udeath.wav"), 1, ATTN_NORM, 0);
@@ -1030,6 +1104,11 @@ void CopyToBodyQue (edict_t *ent)
 {
 	edict_t		*body;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	// grab a body que and cycle to the next one
 	body = &g_edicts[(int)maxclients->value + level.body_que + 1];
 	level.body_que = (level.body_que + 1) % BODY_QUEUE_SIZE;
@@ -1062,6 +1141,11 @@ void CopyToBodyQue (edict_t *ent)
 
 void respawn (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value || coop->value)
 	{
 		// spectator's don't leave bodies
@@ -1108,6 +1192,11 @@ void PutClientInServer (edict_t *ent)
 	client_persistant_t	saved;
 	client_respawn_t	resp;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	// find a spawn point
 	// do it before setting health back up, so farthest
 	// ranging doesn't count this client
@@ -1261,6 +1350,11 @@ deathmatch mode, so clear everything out before starting them.
 */
 void ClientBeginDeathmatch (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	G_InitEdict (ent);
 
 	InitClientResp (ent->client);
@@ -1293,6 +1387,11 @@ void ClientBegin (edict_t *ent)
 {
 	int		i;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->client = game.clients + (ent - g_edicts - 1);
 
 	if (deathmatch->value)
@@ -1360,6 +1459,11 @@ void ClientUserinfoChanged (edict_t *ent, char *userinfo)
 	char	*s;
 	int		playernum;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	// check for malformed or illegal info strings
 	if (!Info_Validate(userinfo))
 	{
@@ -1429,6 +1533,11 @@ qboolean ClientConnect (edict_t *ent, char *userinfo)
 {
 	char	*value;
 
+	if (!ent)
+	{
+		return false;
+	}
+
 	// check to see if they are on the banned IP list
 	value = Info_ValueForKey (userinfo, "ip");
 
@@ -1472,6 +1581,11 @@ void ClientDisconnect (edict_t *ent)
 {
 	int		playernum;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (!ent->client)
 		return;
 
@@ -1521,6 +1635,11 @@ void PrintPmove (pmove_t *pm)
 {
 	unsigned	c1, c2;
 
+	if (!pm)
+	{
+		return;
+	}
+
 	c1 = CheckBlock (&pm->s, sizeof(pm->s));
 	c2 = CheckBlock (&pm->cmd, sizeof(pm->cmd));
 	Com_Printf ("sv %3i:%i %i\n", pm->cmd.impulse, c1, c2);
@@ -1541,6 +1660,11 @@ void ClientThink (edict_t *ent, usercmd_t *ucmd)
 	int		i, j;
 	pmove_t	pm;
 
+	if (!ent || !ucmd)
+	{
+		return;
+	}
+
 	level.current_entity = ent;
 	client = ent->client;
 
@@ -1695,6 +1819,11 @@ void ClientBeginServerFrame (edict_t *ent)
 	gclient_t	*client;
 	int			buttonMask;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (level.intermissiontime)
 		return;
 

src/player/hud.c

@@ -12,6 +12,11 @@ INTERMISSION
 
 void MoveClientToIntermission (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if (deathmatch->value || coop->value)
 		ent->client->showscores = true;
 	VectorCopy (level.intermission_origin, ent->s.origin);
@@ -56,6 +61,11 @@ void BeginIntermission (edict_t *targ)
 	int		i, n;
 	edict_t	*ent, *client;
 
+	if (!targ)
+	{
+		return;
+	}
+
 	if (level.intermissiontime)
 		return;		// already activated
 
@@ -160,6 +170,11 @@ void DeathmatchScoreboardMessage (edict_t *ent, edict_t *killer)
 	edict_t		*cl_ent;
 	char	*tag;
 
+	if (!ent || !killer)
+	{
+		return;
+	}
+
 	// sort the clients by score
 	total = 0;
 	for (i=0 ; i<game.maxclients ; i++)
@@ -245,6 +260,11 @@ Note that it isn't that hard to overflow the 1400 byte message limit!
 */
 void DeathmatchScoreboard (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	DeathmatchScoreboardMessage (ent, ent->enemy);
 	gi.unicast (ent, true);
 }
@@ -259,6 +279,11 @@ Display the scoreboard
 */
 void Cmd_Score_f (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->client->showinventory = false;
 	ent->client->showhelp = false;
 
@@ -288,6 +313,11 @@ void HelpComputer (edict_t *ent)
 	char	string[1024];
 	char	*sk;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (skill->value == SKILL_EASY)
 		sk = "easy";
 	else if (skill->value == SKILL_MEDIUM)
@@ -329,6 +359,11 @@ Display the current help message
 */
 void Cmd_Help_f (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	// this is for backwards compatability
 	if (deathmatch->value)
 	{
@@ -364,6 +399,11 @@ void G_SetStats (edict_t *ent)
 	int			index, cells;
 	int			power_armor_type;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	cells = 0;
 
 	//

src/player/trail.c

@@ -78,6 +78,11 @@ edict_t *PlayerTrail_PickFirst (edict_t *self)
 	int		marker;
 	int		n;
 
+	if (!self)
+	{
+		return NULL;
+	}
+
 	if (!trail_active)
 		return NULL;
 
@@ -107,6 +112,11 @@ edict_t *PlayerTrail_PickNext (edict_t *self)
 	int		marker;
 	int		n;
 
+	if (!self)
+	{
+		return NULL;
+	}
+
 	if (!trail_active)
 		return NULL;
 

src/player/view.c

@@ -60,6 +60,11 @@ void P_DamageFeedback (edict_t *player)
 	static	vec3_t	acolor = {1.0, 1.0, 1.0};
 	static	vec3_t	bcolor = {1.0, 0.0, 0.0};
 
+	if (!player)
+	{
+		return;
+	}
+
 	client = player->client;
 
 	// flash the backgrounds behind the status numbers
@@ -208,6 +213,10 @@ void SV_CalcViewOffset (edict_t *ent)
 	float		delta;
 	vec3_t		v;
 
+	if (!ent)
+	{
+		return;
+	}
 
 	//===================================
 
@@ -374,6 +383,11 @@ void SV_CalcGunOffset (edict_t *ent)
 	int		i;
 	float	delta;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	// if we're using the sniper rifle, let's not do this
 	if (ent->client->pers.weapon &&
 		Q_stricmp(ent->client->pers.weapon->classname, "weapon_sniperrifle") != 0)
@@ -458,6 +472,11 @@ void SV_CalcBlend (edict_t *ent)
 	vec3_t	vieworg;
 	int		remaining;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->client->ps.blend[0] = ent->client->ps.blend[1] = 
 	ent->client->ps.blend[2] = ent->client->ps.blend[3] = 0;
 
@@ -556,6 +575,11 @@ void P_FallingDamage (edict_t *ent)
 	int		damage;
 	vec3_t	dir;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->s.modelindex != 255)
 		return;		// not in the player model
 
@@ -799,6 +823,11 @@ void G_SetClientEffects (edict_t *ent)
 	int		pa_type;
 	int		remaining;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->s.effects = 0;
 	ent->s.renderfx = 0;
 
@@ -861,6 +890,11 @@ void G_SetClientEvent (edict_t *ent)
 	if (ent->s.event)
 		return;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if ( ent->groundentity && xyspeed > 225)
 	{
 		if ( (int)(current_client->bobtime+bobmove) != bobcycle )
@@ -877,6 +911,11 @@ void G_SetClientSound (edict_t *ent)
 {
 	char	*weap;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->client->resp.game_helpchanged != game.helpchanged)
 	{
 		ent->client->resp.game_helpchanged = game.helpchanged;
@@ -890,7 +929,6 @@ void G_SetClientSound (edict_t *ent)
 		gi.sound (ent, CHAN_VOICE, gi.soundindex ("misc/pc_up.wav"), 1, ATTN_STATIC, 0);
 	}
 
-
 	if (ent->client->pers.weapon)
 		weap = ent->client->pers.weapon->classname;
 	else
@@ -920,6 +958,11 @@ void G_SetClientFrame (edict_t *ent)
 	gclient_t	*client;
 	qboolean	duck, run;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->s.modelindex != 255)
 		return;		// not in the player model
 
@@ -960,7 +1003,7 @@ void G_SetClientFrame (edict_t *ent)
 		return;
 	}
 
-newanim:
+	newanim:
 	// return to either a running or standing frame
 	client->anim_priority = ANIM_BASIC;
 	client->anim_duck = duck;
@@ -1019,6 +1062,11 @@ void ClientEndServerFrame (edict_t *ent)
 	float	bobtime;
 	int		i;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	current_player = ent;
 	current_client = ent->client;
 

src/player/weapon.c

@@ -9,6 +9,11 @@ byte		is_silenced;
 
 void playQuadSound(edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->client->quad_framenum > level.framenum)
 		gi.sound(ent, CHAN_ITEM, gi.soundindex("items/damage3.wav"), 1, ATTN_NORM, 0);
 }
@@ -20,6 +25,11 @@ void P_ProjectSource (gclient_t *client, vec3_t point, vec3_t distance, vec3_t f
 {
 	vec3_t	_distance;
 
+	if (!client)
+	{
+		return;
+	}
+
 	VectorCopy (distance, _distance);
 	if (client->pers.hand == LEFT_HANDED)
 		_distance[1] *= -1;
@@ -45,6 +55,11 @@ void PlayerNoise(edict_t *who, vec3_t where, int type)
 {
 	edict_t		*noise;
 
+	if (!who)
+	{
+		return;
+	}
+
 	if (type == PNOISE_WEAPON)
 	{
 		if (who->client->silencer_shots)
@@ -106,6 +121,11 @@ qboolean Pickup_Weapon (edict_t *ent, edict_t *other)
 	int			index;
 	gitem_t		*ammo;
 
+	if (!ent || !other)
+	{
+		return false;
+	}
+
 	index = ITEM_INDEX(ent->item);
 
 	if ( ( ((int)(dmflags->value) & DF_WEAPONS_STAY) || coop->value) 
@@ -161,6 +181,11 @@ current
 */
 void ChangeWeapon (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->client->grenade_time)
 	{
 		ent->client->grenade_time = level.time;
@@ -211,6 +236,11 @@ NoAmmoWeaponChange
 */
 void NoAmmoWeaponChange (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if ( ent->client->pers.inventory[ITEM_INDEX(FindItem("slugs"))]
 		&&  ent->client->pers.inventory[ITEM_INDEX(FindItem("railgun"))] )
 	{
@@ -259,6 +289,11 @@ Called by ClientBeginServerFrame and ClientThink
 */
 void Think_Weapon (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	// if just died, put the weapon away
 	if (ent->health < 1)
 	{
@@ -282,6 +317,11 @@ void Think_Weapon (edict_t *ent)
 
 void stuffcmd(edict_t *e, char *s)
 {
+	if (!e)
+	{
+		return;
+	}
+
 	gi.WriteByte (11);
 	gi.WriteString (s);
 	gi.unicast (e, true);
@@ -300,6 +340,11 @@ void Use_Weapon (edict_t *ent, gitem_t *item)
 	int			ammo_index;
 	gitem_t		*ammo_item;
 
+	if (!ent || !item)
+	{
+		return;
+	}
+
 	// see if we're already using it
 	if (item == ent->client->pers.weapon)
 	{
@@ -343,6 +388,11 @@ void Drop_Weapon (edict_t *ent, gitem_t *item)
 {
 	int		index;
 
+	if (!ent || !item)
+	{
+		return;
+	}
+
 	if ((int)(dmflags->value) & DF_WEAPONS_STAY)
 		return;
 
@@ -374,6 +424,11 @@ void Weapon_Generic (edict_t *ent, int FRAME_ACTIVATE_LAST, int FRAME_FIRE_LAST,
 {
 	int		n;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->client->weaponstate == WEAPON_DROPPING)
 	{
 		if (ent->client->ps.gunframe == FRAME_DEACTIVATE_LAST)
@@ -507,6 +562,11 @@ void weapon_grenade_fire (edict_t *ent, qboolean held)
 	int		speed;
 	float	radius;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	radius = damage+40;
 	if (is_quad)
 		damage *= 4;
@@ -530,6 +590,11 @@ void weapon_grenade_fire (edict_t *ent, qboolean held)
 
 void Weapon_Grenade (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if ((ent->client->newweapon) && (ent->client->weaponstate == WEAPON_READY))
 	{
 		ChangeWeapon (ent);
@@ -650,6 +715,11 @@ void weapon_grenadelauncher_fire (edict_t *ent)
 	int		damage;
 	float	radius;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if(GetItemByIndex(ent->client->ammo_index)->tag == AMMO_GRENADES)
 	{
 		damage = 120;
@@ -693,6 +763,11 @@ void Weapon_GrenadeLauncher (edict_t *ent)
 	static int	pause_frames[]	= {34, 51, 59, 0};
 	static int	fire_frames[]	= {6, 0};
 
+	if (!ent)
+	{
+		return;
+	}
+
 	Weapon_Generic (ent, 5, 16, 59, 64, pause_frames, fire_frames, weapon_grenadelauncher_fire);
 }
 
@@ -711,6 +786,11 @@ void Weapon_RocketLauncher_Fire (edict_t *ent)
 	float	damage_radius;
 	int		radius_damage;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	damage = 100 + (int)(random() * 20.0);
 	radius_damage = 120;
 	damage_radius = 120;
@@ -759,6 +839,11 @@ void Weapon_RocketLauncher (edict_t *ent)
 	static int	pause_frames[]	= {25, 33, 42, 50, 0};
 	static int	fire_frames[]	= {5, 0};
 
+	if (!ent)
+	{
+		return;
+	}
+
 	Weapon_Generic (ent, 4, 12, 50, 54, pause_frames, fire_frames, Weapon_RocketLauncher_Fire);
 }
 
@@ -778,6 +863,11 @@ int Blaster_Fire (edict_t *ent, vec3_t g_offset, int damage, qboolean hyper, int
 	vec3_t	offset;
 	int ret = 1;
 
+	if (!ent)
+	{
+		return 0;
+	}
+
 	if (is_quad)
 		damage *= 4;
 	AngleVectors (ent->client->v_angle, forward, right, NULL);
@@ -820,6 +910,11 @@ void Weapon_Blaster_Fire (edict_t *ent)
 {
 	int		damage;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 		damage = 15;
 	else
@@ -833,6 +928,11 @@ void Weapon_Blaster (edict_t *ent)
 	static int	pause_frames[]	= {19, 32, 0};
 	static int	fire_frames[]	= {5, 0};
 
+	if (!ent)
+	{
+		return;
+	}
+
 	Weapon_Generic (ent, 4, 8, 52, 55, pause_frames, fire_frames, Weapon_Blaster_Fire);
 }
 
@@ -844,6 +944,11 @@ void Weapon_HyperBlaster_Fire (edict_t *ent)
 	int		effect;
 	int		damage;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->client->weapon_sound = gi.soundindex("weapons/hyprbl1a.wav");
 
 	if (!(ent->client->buttons & BUTTON_ATTACK))
@@ -902,6 +1007,11 @@ void Weapon_HyperBlaster (edict_t *ent)
 	static int	pause_frames[]	= {0};
 	static int	fire_frames[]	= {6, 7, 8, 9, 10, 11, 0};
 
+	if (!ent)
+	{
+		return;
+	}
+
 	Weapon_Generic (ent, 5, 20, 49, 53, pause_frames, fire_frames, Weapon_HyperBlaster_Fire);
 }
 
@@ -923,6 +1033,11 @@ void Machinegun_Fire (edict_t *ent)
 	int			kick = 2;
 	vec3_t		offset;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (!(ent->client->buttons & BUTTON_ATTACK))
 	{
 		ent->client->machinegun_shots = 0;
@@ -995,6 +1110,11 @@ void Weapon_Machinegun (edict_t *ent)
 	static int	pause_frames[]	= {23, 45, 0};
 	static int	fire_frames[]	= {4, 5, 0};
 
+	if (!ent)
+	{
+		return;
+	}
+
 	Weapon_Generic (ent, 3, 5, 45, 49, pause_frames, fire_frames, Machinegun_Fire);
 }
 
@@ -1009,6 +1129,11 @@ void Chaingun_Fire (edict_t *ent)
 	int			damage;
 	int			kick = 2;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 		damage = 6;
 	else
@@ -1120,6 +1245,11 @@ void Weapon_Chaingun (edict_t *ent)
 	static int	pause_frames[]	= {38, 43, 51, 61, 0};
 	static int	fire_frames[]	= {5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 0};
 
+	if (!ent)
+	{
+		return;
+	}
+
 	Weapon_Generic (ent, 4, 31, 61, 64, pause_frames, fire_frames, Chaingun_Fire);
 }
 
@@ -1140,6 +1270,11 @@ void weapon_shotgun_fire (edict_t *ent)
 	int			damage = 4;
 	int			kick = 8;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->client->ps.gunframe == 9)
 	{
 		ent->client->ps.gunframe++;
@@ -1186,6 +1321,11 @@ void Weapon_Shotgun (edict_t *ent)
 	static int	pause_frames[]	= {22, 28, 34, 0};
 	static int	fire_frames[]	= {8, 9, 0};
 
+	if (!ent)
+	{
+		return;
+	}
+
 	Weapon_Generic (ent, 7, 18, 36, 39, pause_frames, fire_frames, weapon_shotgun_fire);
 }
 
@@ -1199,6 +1339,11 @@ void weapon_supershotgun_fire (edict_t *ent)
 	int			damage = 6;
 	int			kick = 12;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	AngleVectors (ent->client->v_angle, forward, right, NULL);
 
 	VectorScale (forward, -2, ent->client->kick_origin);
@@ -1243,6 +1388,11 @@ void Weapon_SuperShotgun (edict_t *ent)
 	static int	pause_frames[]	= {29, 42, 57, 0};
 	static int	fire_frames[]	= {7, 0};
 
+	if (!ent)
+	{
+		return;
+	}
+
 	Weapon_Generic (ent, 6, 17, 57, 61, pause_frames, fire_frames, weapon_supershotgun_fire);
 }
 
@@ -1264,6 +1414,11 @@ void weapon_railgun_fire (edict_t *ent)
 	int			damage;
 	int			kick;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{	// normal damage is too extreme in dm
 		damage = 100;
@@ -1320,6 +1475,11 @@ void Weapon_Railgun (edict_t *ent)
 	static int	pause_frames[]	= {56, 0};
 	static int	fire_frames[]	= {4, 0};
 
+	if (!ent)
+	{
+		return;
+	}
+
 	Weapon_Generic (ent, 3, 18, 56, 61, pause_frames, fire_frames, weapon_railgun_fire);
 }
 
@@ -1339,6 +1499,11 @@ void weapon_bfg_fire (edict_t *ent)
 	int		damage;
 	float	damage_radius = 1000;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	AngleVectors (ent->client->v_angle, forward, right, NULL);
 	VectorScale (forward, -2, ent->client->kick_origin);
 
@@ -1416,6 +1581,11 @@ void Weapon_BFG (edict_t *ent)
 	static int	pause_frames[]	= {39, 45, 50, 55, 0};
 	static int	fire_frames[]	= {9, 17, 0};
 
+	if (!ent)
+	{
+		return;
+	}
+
 	Weapon_Generic (ent, 8, 32, 55, 58, pause_frames, fire_frames, weapon_bfg_fire);
 }
 

src/zaero/acannon.c

@@ -199,6 +199,11 @@ void monster_autocannon_fire(edict_t *self)
 {
 	vec3_t forward, right, start;
 
+	if (!self)
+	{
+		return;
+	}
+
 	// fire straight ahead
 	AngleVectors (self->s.angles, forward, right, NULL);
 	if (self->onFloor)
@@ -275,6 +280,11 @@ qboolean canShoot(edict_t *self, edict_t *e)
 	vec3_t delta;
 	vec3_t dangles;
 
+	if (!self || !e)
+	{
+		return false;
+	}
+
 	VectorSubtract(e->s.origin, self->s.origin, delta);
 	vectoangles(delta, dangles);
 	dangles[PITCH] = mod180(dangles[PITCH]);
@@ -305,6 +315,11 @@ qboolean autocannonInfront (edict_t *self, edict_t *other)
 	float min = -30.0;
 	float max = 30.0;
 
+	if (!self || !other)
+	{
+		return false;
+	}
+
 	// what's the yaw distance between the 2?
 	VectorSubtract (other->s.origin, self->s.origin, vec);
 	vectoangles(vec, angle);
@@ -319,6 +334,11 @@ void monster_autocannon_findenemy(edict_t *self)
 {
 	edict_t *e = NULL;
 
+	if (!self)
+	{
+		return;
+	}
+
 	// can we still use our enemy?
 	if (self->enemy)
 	{
@@ -407,6 +427,12 @@ void monster_autocannon_turn(edict_t *self)
 {
 	vec3_t old_angles;
 	VectorCopy(self->s.angles, old_angles);
+
+	if (!self)
+	{
+		return;
+	}
+
 	if (!self->enemy)
 	{
 		if (self->monsterinfo.linkcount > 0)
@@ -518,6 +544,11 @@ void monster_autocannon_think(edict_t *self)
 	int lefty = 0;
 	edict_t *old_enemy;
 
+	if (!self)
+	{
+		return;
+	}
+
 	self->nextthink = level.time + FRAMETIME;
 
 	// get an enemy
@@ -599,6 +630,11 @@ void monster_autocannon_explode (edict_t *ent)
 {
 	vec3_t origin;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	T_RadiusDamage(ent, ent, AC_EXPLODE_DMG, ent->enemy, AC_EXPLODE_RADIUS, MOD_TRIPBOMB);
 
 	VectorMA (ent->s.origin, -0.02, ent->velocity, origin);
@@ -631,6 +667,11 @@ void monster_autocannon_explode (edict_t *ent)
 
 void monster_autocannon_die (edict_t *self, edict_t *inflictor, edict_t *attacker, int damage, vec3_t point)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	// explode
 	self->takedamage = DAMAGE_NO;
 	self->think = monster_autocannon_explode;
@@ -639,6 +680,11 @@ void monster_autocannon_die (edict_t *self, edict_t *inflictor, edict_t *attacke
 
 void monster_autocannon_pain (edict_t *self, edict_t *other, float kick, int damage)
 {
+	if (!self || !other)
+	{
+		return;
+	}
+
 	// keep the enemy
 	if (other->client || other->svflags & SVF_MONSTER)
 		self->enemy = other;
@@ -646,6 +692,11 @@ void monster_autocannon_pain (edict_t *self, edict_t *other, float kick, int dam
 
 void monster_autocannon_activate(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->active = AC_S_ACTIVATING;
 	self->nextthink = level.time + FRAMETIME;
 
@@ -677,6 +728,11 @@ void monster_autocannon_activate(edict_t *self)
 
 void monster_autocannon_deactivate(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->active = AC_S_DEACTIVATING;
 	self->nextthink = level.time + FRAMETIME;
 	
@@ -723,6 +779,11 @@ void monster_autocannon_deactivate(edict_t *self)
 
 void monster_autocannon_act(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->active == AC_S_IDLE)
 	{
 		if (acActStart[self->style] != -1)
@@ -759,6 +820,11 @@ void monster_autocannon_act(edict_t *self)
 
 void monster_autocannon_use(edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	// on/off or berserk toggle?
 	if (self->spawnflags & AC_SF_BERSERK_TOGGLE)
 	{
@@ -773,6 +839,11 @@ void monster_autocannon_use(edict_t *self, edict_t *other, edict_t *activator)
 
 void monster_autocannon_usestub(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	// stub
 	monster_autocannon_act(self);
 }
@@ -782,6 +853,11 @@ void SP_monster_autocannon(edict_t *self)
 	edict_t *base, *turret;
 	vec3_t offset;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		G_FreeEdict(self);
@@ -898,6 +974,11 @@ void SP_monster_autocannon(edict_t *self)
 
 void SP_monster_autocannon_floor(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->style == 1)
 	{
 		gi.error("monster_autocannon_floor does not permit bullet style");

src/zaero/ai.c

@@ -1,15 +1,12 @@
 #include "../header/local.h"
 
-
 #define Z_RADUISLISTSIZE	2000
 
-
 void ai_run_melee(edict_t *self);
 qboolean FindTarget (edict_t *self);
 qboolean SV_StepDirection (edict_t *ent, float yaw, float dist);
 void SV_NewChaseDir (edict_t *actor, vec3_t eOrigin, float dist);
 
-
 /*
 =============
 zSchoolAllVisiable
@@ -22,6 +19,11 @@ void zCreateRaduisList(edict_t *self)
 	edict_t *head, *list;
 	vec3_t vec;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if(self->zRaduisList)
 	{
 		// already created for this think, don't bother doing it again...
@@ -49,8 +51,6 @@ void zCreateRaduisList(edict_t *self)
 	list->zRaduisList = NULL;
 };
 
-
-
 /*
 =============
 zSchoolAllVisiable
@@ -63,6 +63,11 @@ int zSchoolAllVisiable(edict_t *self)
 	int max;
 	edict_t *head, *list;
 
+	if (!self)
+	{
+		return 0;
+	}
+
 	max = 0;
 
 	zCreateRaduisList(self);
@@ -86,9 +91,6 @@ int zSchoolAllVisiable(edict_t *self)
 	return max;
 }
 
-
-
-
 /*
 =============
 zFindRoamYaw
@@ -102,6 +104,11 @@ int zFindRoamYaw(edict_t *self, float distcheck)
 	trace_t	tr;
 	float current = anglemod(self->s.angles[YAW]);
 
+	if (!self)
+	{
+		return 0;
+	}
+
 	if(current <= self->ideal_yaw - 1 || current > self->ideal_yaw + 1)
 	{
 		if(fabs(current - self->ideal_yaw) <= 359.0)
@@ -150,8 +157,6 @@ int zFindRoamYaw(edict_t *self, float distcheck)
 	return 0;
 };
 
-
-
 /*
 =============
 zSchoolMonsters
@@ -164,6 +169,11 @@ int zSchoolMonsters(edict_t *self, float dist, int runStyle, float *currentSpeed
 	int maxInsight;
 	int newRunStyle;
 
+	if (!self)
+	{
+		return 0;
+	}
+
 	maxInsight = zSchoolAllVisiable(self);
 
 	// If you're not out in front
@@ -301,8 +311,6 @@ int zSchoolMonsters(edict_t *self, float dist, int runStyle, float *currentSpeed
 	return newRunStyle;
 }
 
-
-
 /*
 =============
 ai_schoolStand
@@ -315,6 +323,11 @@ void ai_schoolStand (edict_t *self, float dist)
 {
 	float speed;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if(!(self->monsterinfo.aiflags & AI_SCHOOLING))
 	{
 		ai_stand(self, dist);
@@ -349,7 +362,6 @@ void ai_schoolStand (edict_t *self, float dist)
 	M_walkmove (self, self->ideal_yaw, dist);
 }
 
-
 /*
 =============
 ai_schoolRun
@@ -361,6 +373,11 @@ void ai_schoolRun (edict_t *self, float dist)
 {
 	float speed;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if(!(self->monsterinfo.aiflags & AI_SCHOOLING))
 	{
 		ai_run(self, dist);
@@ -394,7 +411,6 @@ void ai_schoolRun (edict_t *self, float dist)
 	SV_StepDirection (self, self->ideal_yaw, dist);
 }
 
-
 /*
 =============
 ai_schoolWalk
@@ -406,6 +422,11 @@ void ai_schoolWalk (edict_t *self, float dist)
 {
 	float speed;
 
+	if (!self)
+	{
+		return;
+	}
+
 	if(!(self->monsterinfo.aiflags & AI_SCHOOLING))
 	{
 		ai_walk(self, dist);
@@ -439,7 +460,6 @@ void ai_schoolWalk (edict_t *self, float dist)
 	SV_StepDirection (self, self->ideal_yaw, dist);
 }
 
-
 /*
 =============
 ai_schoolCharge
@@ -450,6 +470,10 @@ Use this call with a distnace of 0 to replace ai_face
 */
 void ai_schoolCharge (edict_t *self, float dist)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	ai_charge(self, dist);
 }
-

src/zaero/anim.c

@@ -108,6 +108,11 @@ anim_data_t *find_monster_animator(edict_t *monster)
 	anim_data_t *anim;
 	int i;
 
+	if (!monster)
+	{
+		return NULL;
+	}
+
 	for(i=0;i<animations_count;i++)
 	{
 		anim = animations[i];
@@ -123,6 +128,11 @@ qboolean anim_player_correct_aim(edict_t *self, vec3_t aim)
 {
 	anim_data_t *anim;
 
+	if (!self)
+	{
+		return false;
+	}
+
 	if(self->extra_data != animations)
 		return false;
 
@@ -166,6 +176,11 @@ anim_data_t *anim_data_create(edict_t *monster)
 {
 	anim_data_t *data;
 
+	if (!monster)
+	{
+		return NULL;
+	}
+
 	if(!z_frame_get_sequence(monster->classname))
 		return NULL;
 
@@ -206,6 +221,11 @@ anim_data_t *anim_player_create(edict_t *monster)
 	anim_data_t *data;
 	edict_t *anim_player;
 
+	if (!monster)
+	{
+		return NULL;
+	}
+
 	data = anim_data_create(monster);
 	if(!data)
 		return data;
@@ -237,6 +257,11 @@ void advance_anim_frame(anim_data_t *anim, int count)
 {
 	mmove_t *seq;
 
+	if (!anim)
+	{
+		return;
+	}
+
 	anim->moving_forward = (count < 0)? false : true;
 
 	anim->current_frame += count;
@@ -252,6 +277,11 @@ void anim_player_think(edict_t *anim_player)
 {
 	anim_data_t *data;
 
+	if (!anim_player)
+	{
+		return;
+	}
+
 	data = (anim_data_t *)anim_player->extra_data;
 
 	update_directions(data);
@@ -275,6 +305,11 @@ void update_directions(anim_data_t *data)
 	vec3_t ang;
 	vec3_t point;
 
+	if (!data)
+	{
+		return;
+	}
+
 	switch(data->facing)
 	{
 		case DIR_AT_CLIENT:
@@ -306,6 +341,11 @@ void update_directions(anim_data_t *data)
   =========================================================================*/
 void ai_animator(edict_t *self, float dist)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if(dist != 0.0)
 		M_walkmove (self, self->s.angles[YAW], dist);
 
@@ -317,6 +357,11 @@ void ai_animator(edict_t *self, float dist)
   =========================================================================*/
 void update_frame_buffer(anim_data_t *data)
 {
+	if (!data)
+	{
+		return;
+	}
+
 	// defaults
 	data->monster_frames[0].aifunc = NULL;
 	data->monster_frames[0].dist = 0.0;
@@ -359,6 +404,11 @@ int get_total_frame_count(anim_data_t *data)
 	int total_frames = 0;
 	mmove_t **seq;
 
+	if (!data)
+	{
+		return 0;
+	}
+
 	seq = data->monster_sequences;
 	while(*seq)
 	{
@@ -382,6 +432,11 @@ void calculate_buffer_actuals(anim_data_t *data)
 {
 	int seq_frames, idx;
 
+	if (!data)
+	{
+		return;
+	}
+
 	if(data->current_sequence)
 	{
 		data->actual_sequence = data->monster_sequences[data->current_sequence - 1];
@@ -488,6 +543,11 @@ void anim_player_set_facing(anim_dir_t facing)
 	anim_data_t *anim;
 	int i;
 
+	if (!facing)
+	{
+		return;
+	}
+
 	for(i=0;i<animations_count;i++)
 	{
 		anim = animations[i];
@@ -506,6 +566,11 @@ void anim_player_set_aim(anim_dir_t aim)
 	anim_data_t *anim;
 	int i;
 
+	if (!aim)
+	{
+		return;
+	}
+
 	for(i=0;i<animations_count;i++)
 	{
 		anim = animations[i];
@@ -649,6 +714,11 @@ void anim_player_cmd(edict_t *ent)
 {
 	char *args, *arg1=NULL, *arg2=NULL;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	args = gi.args();
 
 	if(!cut_up_string(&args, &arg1))

src/zaero/camera.c

@@ -6,7 +6,6 @@
 
 void zCam_SetLocalCopy(struct edict_s *player, char *s);
 
-
 void zCam_TrackEntity(struct edict_s *player, struct edict_s *track, qboolean playerVisiable, qboolean playerOffset)
 {
 	if(player->client == NULL)
@@ -51,7 +50,6 @@ void zCam_TrackEntity(struct edict_s *player, struct edict_s *track, qboolean pl
 	}
 }
 
-
 void zCam_Stop(struct edict_s *player)
 {
 	if(player->client == NULL)
@@ -78,7 +76,6 @@ void zCam_Stop(struct edict_s *player)
 	}
 }
 
-
 char *getSkinModel(char *s, char *buffer)
 {
   char *cp;

src/zaero/frames.c

@@ -7,7 +7,6 @@
    Monster frame move lists.
   **************************************************************************/
 
-
 /*=========================================================================
    Hound.
   =========================================================================*/
@@ -30,7 +29,6 @@ mmove_t *frame_moves_hound[] = {
          &hound_move_death,
          NULL};
 
-
 /*=========================================================================
    Sentien.
   =========================================================================*/

src/zaero/item.c

@@ -1,6 +1,5 @@
 #include "../header/local.h"
 
-
 extern qboolean is_quad;
 extern byte is_silenced;
 
@@ -24,7 +23,6 @@ void zCam_Stop(struct edict_s *player);
 
 void fire_empnuke(edict_t	*ent, vec3_t center, int radius);
 
-
 /*
 	misc_securitycamera
 
@@ -32,6 +30,11 @@ void fire_empnuke(edict_t	*ent, vec3_t center, int radius);
 */
 void use_securitycamera (edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->active = !self->active;
 }
 
@@ -39,6 +42,11 @@ void use_securitycamera (edict_t *self, edict_t *other, edict_t *activator)
 #define CAMERA_FRAME_LAST	59
 void securitycamera_think(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->active)
 	{
 		self->s.frame++;
@@ -62,6 +70,11 @@ void securitycamera_think(edict_t *self)
 
 void camera_pain(edict_t *self, edict_t *other, float kick, int damage)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->timeout = level.time + FRAMETIME * 2;
 }
 
@@ -69,6 +82,11 @@ void SP_misc_securitycamera(edict_t *self)
 {
 	vec3_t offset, forward, up;
 
+	if (!self)
+	{
+		return;
+	}
+
 	// no message? error
 	if (!self->message)
 	{
@@ -129,6 +147,12 @@ char *camera_statusbar =
 void updateVisorHud(edict_t *ent)
 {
 	static char buf[1024];
+
+	if (!ent)
+	{
+		return;
+	}
+
 	gi.WriteByte (svc_layout);
 	sprintf(buf, camera_statusbar, ent->client->zCameraTrack->message);
 	gi.WriteString(buf);
@@ -136,11 +160,21 @@ void updateVisorHud(edict_t *ent)
 
 void startVisorStatic(edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->client->zCameraStaticFramenum = level.time + FRAMETIME * 2;
 }
 
 void startVisor(edict_t *ent, edict_t *e)
 {
+	if (!ent || !e)
+	{
+		return;
+	}
+
 	// don't do anything if we're already at the destination camera
 	if (e == ent->client->zCameraTrack)
 		return;
@@ -166,6 +200,11 @@ void startVisor(edict_t *ent, edict_t *e)
 
 void stopCamera(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	zCam_Stop(self);
 	self->client->showscores = false;
 	gi.sound(self, CHAN_AUTO, gi.soundindex("items/visor/deact.wav"), 1, ATTN_NORM, 0);
@@ -175,6 +214,11 @@ edict_t *findNextCamera(edict_t *old)
 {
 	edict_t *e = NULL;
 
+	if (!old)
+	{
+		return NULL;
+	}
+
 	// first of all, are there *any* cameras?
 	e = G_Find(NULL, FOFS(classname), "misc_securitycamera");
 	if (e == NULL)
@@ -201,6 +245,11 @@ edict_t *findNextCamera(edict_t *old)
 
 void Use_Visor (edict_t *ent, gitem_t *item)
 {
+	if (!ent || !item)
+	{
+		return;
+	}
+
 	if (ent->client->zCameraTrack == NULL)
 	{
 		edict_t *e = findNextCamera(NULL);
@@ -228,16 +277,18 @@ void Use_Visor (edict_t *ent, gitem_t *item)
 	}
 }
 
-
 /*
 =================
 EMP Nuke
 =================
 */
-
-
 void weapon_EMPNuke_fire (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	fire_empnuke(ent, ent->s.origin, 1024);
 
 	ent->client->pers.inventory[ent->client->ammo_index]--;
@@ -254,12 +305,16 @@ void weapon_EMPNuke_fire (edict_t *ent)
 	}
 }
 
-
 void Weapon_EMPNuke (edict_t *ent)
 {
 	static int	pause_frames[] = {25, 34, 43, 0};
 	static int	fire_frames[]	= {16, 0};
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		if (ent->client->ps.gunframe == 0)
@@ -279,15 +334,23 @@ void Weapon_EMPNuke (edict_t *ent)
 	Weapon_Generic (ent, 9, 16, 43, 47, pause_frames, fire_frames, weapon_EMPNuke_fire);
 }
 
-
 void empnukeFinish(edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	G_FreeEdict(ent);
 }
 
-
 void empBlastAnim(edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->s.frame++;
 	ent->s.skinnum++;
 
@@ -307,11 +370,15 @@ void empBlastAnim(edict_t	*ent)
 	}
 }
 
-
 void fire_empnuke(edict_t *ent, vec3_t center, int radius)
 {
 	edict_t	*empnuke;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	gi.sound(ent, CHAN_VOICE, gi.soundindex("items/empnuke/emp_trg.wav"), 1, ATTN_NORM, 0);
 
 	empnuke = G_Spawn();
@@ -328,11 +395,15 @@ void fire_empnuke(edict_t	*ent, vec3_t center, int radius)
 	gi.linkentity (empnuke);
 }
 
-
 qboolean EMPNukeCheck(edict_t *ent, vec3_t pos)
 {
 	edict_t	*check = NULL;
 
+	if (!ent)
+	{
+		return false;
+	}
+
 	while ((check = G_Find (check, FOFS(classname), "EMPNukeCenter")) != NULL)
 	{
 		vec3_t	v;
@@ -355,9 +426,13 @@ qboolean EMPNukeCheck(edict_t	*ent, vec3_t pos)
 Plasma Shield
 =================
 */
-
 void PlasmaShield_die (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{
 		gi.sound(self, CHAN_VOICE, gi.soundindex("items/plasmashield/psdie.wav"), 1, ATTN_NORM, 0);
@@ -365,19 +440,27 @@ void PlasmaShield_die (edict_t *self)
 	G_FreeEdict(self);
 }
 
-
 void PlasmaShield_killed (edict_t *self, edict_t *inflictor, edict_t *attacker, int damage, vec3_t point)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	PlasmaShield_die(self);
 }
 
-
 void Use_PlasmaShield (edict_t *ent, gitem_t *item)
 {
 	int ammoIdx = ITEM_INDEX(item);
 	edict_t	*PlasmaShield;
 	vec3_t forward, right, up, frontbottomleft, backtopright;
 
+	if (!ent || !item)
+	{
+		return;
+	}
+
 	if(!ent->client->pers.inventory[ammoIdx])
 	{
 		return;
@@ -440,6 +523,11 @@ void barrel_touch (edict_t *self, edict_t *other, cplane_t *plane, csurface_t *s
 
 void setupCrate(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->solid = SOLID_BBOX;
 	self->movetype = MOVETYPE_FALLFLOAT;
 
@@ -455,6 +543,11 @@ void setupCrate(edict_t *self)
 
 void SP_misc_crate(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	// setup specific to this size
 	self->s.modelindex = gi.modelindex("models/objects/crate/crate64.md2");
 	VectorSet (self->mins, -32, -32, 0);
@@ -466,6 +559,11 @@ void SP_misc_crate(edict_t *self)
 
 void SP_misc_crate_medium(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	// setup specific to this size
 	self->s.modelindex = gi.modelindex("models/objects/crate/crate48.md2");
 	VectorSet (self->mins, -24, -24, 0);
@@ -477,6 +575,11 @@ void SP_misc_crate_medium(edict_t *self)
 
 void SP_misc_crate_small(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	// setup specific to this size
 	self->s.modelindex = gi.modelindex("models/objects/crate/crate32.md2");
 	VectorSet (self->mins, -16, -16, 0);
@@ -490,6 +593,12 @@ qboolean thruBarrier(edict_t *targ, edict_t *inflictor)
 {
 	trace_t tr;
 	edict_t *e = inflictor;
+
+	if (!targ || !inflictor)
+	{
+		return false;
+	}
+
 	while(e)
 	{
 		tr = gi.trace(e->s.origin, NULL, NULL, targ->s.origin, e, MASK_SHOT);
@@ -512,6 +621,11 @@ qboolean thruBarrier(edict_t *targ, edict_t *inflictor)
 
 void barrier_think(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->timeout > level.time)
 	{
 		self->svflags &= ~SVF_NOCLIENT;
@@ -526,6 +640,11 @@ void barrier_think(edict_t *self)
 
 void barrier_pain(edict_t *self, edict_t *other, float kick, int damage)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->timeout = level.time + FRAMETIME * 2;
 	if (self->damage_debounce_time < level.time)
 	{
@@ -533,8 +652,14 @@ void barrier_pain(edict_t *self, edict_t *other, float kick, int damage)
 		self->damage_debounce_time = level.time + FRAMETIME * 2;
 	}
 }
+
 void barrier_touch (edict_t *self, edict_t *other, cplane_t *plane, csurface_t *surf)
 {
+	if (!self || !other)
+	{
+		return;
+	}
+
 	if (other == world)
 		return;
 
@@ -549,6 +674,11 @@ void barrier_touch (edict_t *self, edict_t *other, cplane_t *plane, csurface_t *
 
 void SP_func_barrier(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->solid = SOLID_BBOX;
 	self->movetype = MOVETYPE_NONE;
 	self->s.modelindex = gi.modelindex("models/objects/wall/tris.md2");
@@ -567,6 +697,11 @@ void SP_func_barrier(edict_t *self)
 
 void SP_misc_seat(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->s.modelindex = gi.modelindex("models/objects/seat/tris.md2");
 	VectorSet(self->mins, -16, -16, 0);
 	VectorSet(self->maxs, 16, 16, 40);

src/zaero/mtest.c

@@ -12,7 +12,6 @@ void Weapon_Generic (edict_t *ent,
 					 void (*fire)(edict_t *ent));
 void P_ProjectSource (gclient_t *client, vec3_t point, vec3_t distance, vec3_t forward, vec3_t right, vec3_t result);
 
-
 static char testItem_className[256];
 static char testItem_gModel[256];
 static char testItem_icon[256];
@@ -21,27 +20,27 @@ static char testItem_aminationFramesStr[4096];
 static int	testItem_aminationFrames[100];
 static vec3_t testItem_Size[2];
 
-
 gitem_t *testItem;
 edict_t *testItemDroped = NULL;
 int animUpto;
 qboolean testitemOriginMove = false;
 float animSpeed = 1.0;
 
-
-
-
 float lineSize = 100.0f;
 
 void Weapon_LineDraw_Fire (edict_t *ent);
 
 void Weapon_LineDraw_Think (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	Weapon_LineDraw_Fire (ent->owner);
 	ent->owner->client->ps.gunframe--;
 }
 
-
 void Weapon_LineDraw_Fire (edict_t *ent)
 {
 	edict_t *beam;
@@ -49,6 +48,11 @@ void Weapon_LineDraw_Fire (edict_t *ent)
 	vec3_t	forward, right;
 	vec3_t	offset;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	AngleVectors (ent->client->v_angle, forward, right, NULL);
 
 	VectorSet(offset, 0, 7,  ent->viewheight - 8);
@@ -90,18 +94,19 @@ void Weapon_LineDraw_Fire (edict_t *ent)
 	ent->client->ps.gunframe++;
 }
 
-
-
 void Weapon_LineDraw (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	static int	pause_frames[]	= {19, 32, 0};
 	static int	fire_frames[]	= {5, 0};
 
 	Weapon_Generic (ent, 4, 8, 52, 55, pause_frames, fire_frames, Weapon_LineDraw_Fire);
 }
 
-
-
 static char testWeap_className[256];
 static char testWeap_gModel[256];
 static char testWeap_vModel[256];
@@ -117,10 +122,8 @@ static int  testWeap_FRAME_DEACTIVATE_LAST;
 static int	testWeap_pause_frames[20];
 static int	testWeap_fire_frames[20];
 
-
 gitem_t *testWeapon;
 
-
 void convertToNumbers(char *frames, int *arrayFrames)
 {
   int num = 0;
@@ -157,9 +160,6 @@ void convertToNumbers(char *frames, int *arrayFrames)
   arrayFrames[num] = 0;
 }
 
-
-
-
 void convertToVector(char *vecStr, vec3_t *size)
 {
   int num = 0;
@@ -199,8 +199,6 @@ void convertToVector(char *vecStr, vec3_t *size)
   }
 }
 
-
-
 void InitTestWeapon(void)
 {
   FILE *wCfgFile;
@@ -294,26 +292,37 @@ void InitTestWeapon(void)
   testWeapon->pickup_name = testWeap_name;
 }
 
-
 void Weapon_Test_Fire (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	gi.sound(ent, CHAN_VOICE, gi.soundindex("weapons/blastf1a.wav"), 1, ATTN_NORM, 0);
 	ent->client->ps.gunframe++;
 }
 
-
-
 void Weapon_Test (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	Weapon_Generic (ent, testWeap_FRAME_ACTIVATE_LAST,
 		testWeap_FRAME_FIRE_LAST, testWeap_FRAME_IDLE_LAST,
 		testWeap_FRAME_DEACTIVATE_LAST,
 		testWeap_pause_frames, testWeap_fire_frames, Weapon_Test_Fire);
 }
 
-
 void testitem_think (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if(testItem_aminationFrames[animUpto])
 	{
 		ent->s.frame++;
@@ -333,11 +342,15 @@ void testitem_think (edict_t *ent)
 	ent->nextthink = level.time + (FRAMETIME * animSpeed);
 }
 
-
 void Cmd_TestItem (edict_t *ent)
 {
 	char *cmd;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	cmd = gi.argv(1);
 
 	if (Q_stricmp (cmd, "animnext") == 0)
@@ -408,7 +421,6 @@ void Cmd_TestItem (edict_t *ent)
 	}
 }
 
-
 void InitTestItem(void)
 {
   FILE *wCfgFile;
@@ -493,11 +505,13 @@ void InitTestItem(void)
   testItem->pickup_name = testItem_name;
 }
 
-
-
-
 qboolean Pickup_TestItem (edict_t *ent, edict_t *other)
 {
+	if (!ent)
+	{
+		return false;
+	}
+
 	other->client->pers.inventory[ITEM_INDEX(ent->item)]++;
 
 	return true;
@@ -510,6 +524,11 @@ void Drop_TestItem (edict_t *ent, gitem_t *item)
 	vec3_t	forward, right;
 	vec3_t	offset;
 
+	if (!ent || !item)
+	{
+		return;
+	}
+
 	testitemOriginMove = false;
 
 	testItemDroped = G_Spawn();

src/zaero/spawn.c

@@ -39,6 +39,11 @@ qboolean SpawnZ(gitem_t *item, edict_t *spot)
 	int ang = 0;
 	int startAng = 0;
 
+	if (!item || !spot)
+	{
+		return false;
+	}
+
 	ent = G_Spawn();
 
 	ent->classname = item->classname;

src/zaero/trigger.c

@@ -10,6 +10,11 @@ Echo any sounds that are played within "dmg_radius" radius.
 
 void SP_sound_echo (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	G_FreeEdict(self);
 }
 
@@ -19,6 +24,11 @@ void SP_sound_echo (edict_t *self)
 
 void SP_load_mirrorlevel (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	G_FreeEdict(self);
 }
 
@@ -95,7 +105,6 @@ void printSoundNum()
 }
 #endif
 
-
 /********************************************
 	trigger_laser
 */
@@ -110,6 +119,7 @@ Laser-type trigger
 
 #define TRIGGER_MULTIPLE	1
 void trigger_laser_on (edict_t *self);
+
 void trigger_laser_think (edict_t *self)
 {
 	vec3_t	start;
@@ -117,6 +127,11 @@ void trigger_laser_think (edict_t *self)
 	trace_t	tr;
 	int		count = 8;
 
+	if (!self)
+	{
+		return;
+	}
+
 	self->nextthink = level.time + FRAMETIME;
 	
 	VectorCopy (self->s.origin, start);
@@ -165,6 +180,11 @@ void trigger_laser_think (edict_t *self)
 
 void trigger_laser_on (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->svflags &= ~SVF_NOCLIENT;
 	self->think = trigger_laser_think;
 	trigger_laser_think(self);
@@ -172,6 +192,11 @@ void trigger_laser_on (edict_t *self)
 
 void SP_trigger_laser(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	// if no target
 	if (!self->target)
 	{
@@ -202,9 +227,13 @@ void SP_trigger_laser(edict_t *self)
 
 /*QUAKED misc_commdish (0 .5 .8) (-16 -16 0) (16 16 40)
 */
-
 void Anim_CommDish(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->s.frame++;
 
 	if(self->s.frame >= 98)
@@ -219,6 +248,11 @@ void Anim_CommDish(edict_t *self)
 
 void Use_CommDish (edict_t *ent, edict_t *other, edict_t *activator)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	ent->nextthink = level.time + FRAMETIME;
 	ent->think = Anim_CommDish;
 	ent->use = NULL;
@@ -227,6 +261,11 @@ void Use_CommDish (edict_t *ent, edict_t *other, edict_t *activator)
 
 void SP_misc_commdish (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{	// auto-remove for deathmatch
 		G_FreeEdict (self);

src/zaero/weapon.c

@@ -19,7 +19,6 @@ void check_dodge (edict_t *self, vec3_t start, vec3_t dir, int speed);
 void Grenade_Explode(edict_t *ent);
 void P_ProjectSource (gclient_t *client, vec3_t point, vec3_t distance, vec3_t forward, vec3_t right, vec3_t result);
 
-
 void fire_sconnan (edict_t *self);
 void fire_sconnanEffects (edict_t *self);
 
@@ -48,6 +47,12 @@ void angleToward(edict_t *self, vec3_t point, float speed)
 	float vel = 0.0;
 	vec3_t delta;
 	vec3_t destAngles;
+
+	if (!self)
+	{
+		return;
+	}
+
 	VectorSubtract(point, self->s.origin, delta);
 	vectoangles(delta, destAngles);
 	self->ideal_yaw = destAngles[YAW];
@@ -84,6 +89,11 @@ void angleToward(edict_t *self, vec3_t point, float speed)
 
 void shrapnel_touch (edict_t *ent, edict_t *other, cplane_t *plane, csurface_t *surf)
 {
+	if (!ent || !other)
+	{
+		return;
+	}
+
 	// do damage if we can
 	if (!other->takedamage)
 		return;
@@ -101,6 +111,11 @@ void TripBomb_Explode (edict_t *ent)
 	vec3_t origin;
 	int i = 0;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	T_RadiusDamage(ent, ent->owner ? ent->owner : ent, ent->dmg, ent->enemy, ent->dmg_radius, MOD_TRIPBOMB);
 
 	VectorMA (ent->s.origin, -0.02, ent->velocity, origin);
@@ -157,6 +172,11 @@ void tripbomb_laser_think (edict_t *self)
 	trace_t	tr;
 	int		count = 8;
 
+	if (!self)
+	{
+		return;
+	}
+
 	self->nextthink = level.time + FRAMETIME;
 
 	if (level.time > self->timeout)
@@ -213,6 +233,11 @@ void tripbomb_laser_think (edict_t *self)
 
 void tripbomb_laser_on (edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->svflags &= ~SVF_NOCLIENT;
 	self->think = tripbomb_laser_think;
 
@@ -223,6 +248,11 @@ void tripbomb_laser_on (edict_t *self)
 
 void create_tripbomb_laser(edict_t *bomb)
 {
+	if (!bomb)
+	{
+		return;
+	}
+
 	// create the laser
 	edict_t *laser = G_Spawn();
 	bomb->chain = laser;
@@ -249,6 +279,11 @@ void create_tripbomb_laser(edict_t *bomb)
 
 void use_tripbomb(edict_t *self, edict_t *other, edict_t *activator)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->chain)
 	{
 		// we already have a laser, remove it
@@ -262,6 +297,11 @@ void use_tripbomb(edict_t *self, edict_t *other, edict_t *activator)
 
 void turnOffGlow(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->s.effects &= ~EF_COLOR_SHELL;
 	self->s.renderfx &= ~RF_SHELL_GREEN;
 	self->think = NULL;
@@ -270,6 +310,11 @@ void turnOffGlow(edict_t *self)
 
 void tripbomb_pain(edict_t *self, edict_t *other, float kick, int damage)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	// turn on the glow
 	self->damage_debounce_time = level.time + 0.2;
 
@@ -285,6 +330,11 @@ void tripbomb_pain(edict_t *self, edict_t *other, float kick, int damage)
 
 void tripbomb_think(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	if (self->chain == NULL)
 	{
 		// check whether we need to create the laser
@@ -311,6 +361,11 @@ void tripbomb_think(edict_t *self)
 
 void setupBomb(edict_t *bomb, char *classname, float damage, float damage_radius)
 {
+	if (!bomb)
+	{
+		return;
+	}
+
 	bomb->classname = classname;
 	VectorSet(bomb->mins, -8, -8, -8);
 	VectorSet(bomb->maxs, 8, 8, 8);
@@ -364,6 +419,11 @@ qboolean fire_lasertripbomb(edict_t *self, vec3_t start, vec3_t dir, float timer
 	vec3_t _dir;
 	edict_t *bomb = NULL;
 
+	if (!self)
+	{
+		return false;
+	}
+
 	VectorScale(dir, 64, _dir);
 	VectorAdd(start, _dir, endPos);
 
@@ -403,6 +463,11 @@ qboolean fire_lasertripbomb(edict_t *self, vec3_t start, vec3_t dir, float timer
 
 void weapon_lasertripbomb_fire (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->client->ps.gunframe == 10)
 	{
 		vec3_t	offset;
@@ -462,6 +527,11 @@ void Weapon_LaserTripBomb(edict_t *ent)
 	const int fireFirst = 7;
 	const int activateLast = 6;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->client->weaponstate == WEAPON_DROPPING)
 	{
 		if (ent->client->ps.gunframe == deactivateLast)
@@ -572,6 +642,11 @@ void Weapon_LaserTripBomb(edict_t *ent)
 
 void SP_misc_lasertripbomb(edict_t *bomb)
 {
+	if (!bomb)
+	{
+		return;
+	}
+
 	// precache
 	gi.soundindex("weapons/ired/las_set.wav");
 	gi.soundindex("weapons/ired/las_arm.wav");
@@ -612,10 +687,13 @@ Sonic Cannon
 
 ======================================================================
 */
-
-
 void weapon_sc_fire (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if (!(ent->client->buttons & BUTTON_ATTACK))
 	{
 		ent->client->ps.gunframe++;
@@ -728,6 +806,11 @@ void Weapon_SonicCannon (edict_t *ent)
 	static int	pause_frames[] = {32, 42, 52, 0};
 	static int	fire_frames[]	= {12, 13, 14, 15, 16, 17, 0};
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->client->ps.gunframe == 0)
 	{
 		if (deathmatch->value)
@@ -773,6 +856,11 @@ void fire_sconnanEffects (edict_t *self)
 	vec3_t		offset, v;
 	trace_t		tr;
 
+	if (!self)
+	{
+		return;
+	}
+
 	AngleVectors (self->client->v_angle, forward, right, NULL);
 
 	VectorScale (forward, -3, self->client->kick_origin);
@@ -793,6 +881,11 @@ void fire_sconnanEffects (edict_t *self)
 
 void scexplode_think(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	gi.WriteByte (svc_temp_entity);
 	gi.WriteByte (TE_ROCKET_EXPLOSION);
 	gi.WritePosition (self->s.origin);
@@ -810,6 +903,11 @@ void fire_sconnan (edict_t *self)
 	float damage;
 	float radius;
 
+	if (!self)
+	{
+		return;
+	}
+
 	damage = self->dmg_radius / SC_MAXCELLS;
 	radius = damage * SC_MAXRADIUS;
 	damage = SC_BASEDAMAGE + (damage * SC_DAMGERANGE);
@@ -875,16 +973,20 @@ void FoundTarget (edict_t *self);
 void flare_flash(edict_t *ent)
 {
 	edict_t *target = NULL;
-	
-	// flash
-	while (1)
-	{
 	float dist;
 	float ratio;
 	float dot;
 	vec3_t delta;
 	vec3_t forward;
 
+	if (!ent)
+	{
+		return;
+	}
+
+	// flash
+	while (1)
+	{
 		// get the next entity near us
 		target = findradius(target, ent->s.origin, FLASH_RANGE);
 		if (target == NULL)
@@ -938,6 +1040,11 @@ void flare_flash(edict_t *ent)
 
 void flare_think(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	// on our last leg?
 	if (level.time > self->timeout)
 	{
@@ -970,6 +1077,11 @@ void fire_flare (edict_t *self, vec3_t start, vec3_t dir, int damage, int speed,
 	vec3_t adir;
 	vec3_t up;
 
+	if (!self)
+	{
+		return;
+	}
+
 	vectoangles (dir, adir);
 	AngleVectors (adir, NULL, NULL, up);
 
@@ -1006,6 +1118,11 @@ void Weapon_FlareLauncher_Fire (edict_t *ent)
 	vec3_t	offset, start;
 	vec3_t	forward, right;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	AngleVectors (ent->client->v_angle, forward, right, NULL);
 
 	VectorSet(offset, 8, 8, ent->viewheight-8);
@@ -1034,6 +1151,11 @@ void Weapon_FlareGun (edict_t *ent)
 	static int	pause_frames[]	= {15, 25, 35, 0};
 	static int	fire_frames[]	= {8, 0};
 
+	if (!ent)
+	{
+		return;
+	}
+
 	Weapon_Generic (ent, 5, 14, 44, 48, pause_frames, fire_frames, Weapon_FlareLauncher_Fire);
 }
 
@@ -1047,6 +1169,12 @@ void fire_sniper_bullet (edict_t *self, vec3_t start, vec3_t aimdir, int damage,
 	vec3_t s;
 	edict_t *ignore = self;
 	int i = 0;
+
+	if (!self)
+	{
+		return;
+	}
+
 	VectorMA (start, 8192, aimdir, end);
 	VectorCopy(start, s);
 	for(i=0;i<256;++i) // DG: prevent infinite loop (adapted from q2dos)
@@ -1094,6 +1222,11 @@ void weapon_sniperrifle_fire (edict_t *ent)
 	int damage;
 	int kick;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (deathmatch->value)
 	{	// normal damage is too extreme in dm
 		damage = 150;
@@ -1154,6 +1287,11 @@ void Weapon_SniperRifle(edict_t *ent)
 	const static int spFov = 15;
 	const static int dmFov = 30;
 
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->client->weaponstate == WEAPON_DROPPING)
 	{
 		ent->client->sniperFramenum = 0;
@@ -1281,6 +1419,11 @@ void Weapon_SniperRifle(edict_t *ent)
 
 void weapon_a2k_exp_think(edict_t *self)
 {
+	if (!self)
+	{
+		return;
+	}
+
 	self->s.frame++;
 	self->s.skinnum++;
 
@@ -1299,6 +1442,11 @@ void Z_RadiusDamageVisible(edict_t *inflictor, edict_t *attacker, float damage,
 	vec3_t	v;
 	vec3_t	dir;
 
+	if (!inflictor || !attacker || !ignore)
+	{
+		return;
+	}
+
 	while ((ent = findradius(ent, inflictor->s.origin, radius)) != NULL)
 	{
 		if (ent == ignore)
@@ -1325,10 +1473,14 @@ void Z_RadiusDamageVisible(edict_t *inflictor, edict_t *attacker, float damage,
 	}
 }
 
-
 #define A2K_FRAMENUM	50
 void weapon_a2k_fire (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->client->ps.gunframe == 14)
 	{
 		ent->client->a2kFramenum = level.framenum + A2K_FRAMENUM;
@@ -1384,19 +1536,24 @@ void weapon_a2k_fire (edict_t *ent)
 	}
 }
 
-void Weapon_A2k (edict_t *ent)
+/*
-{
-	/*
 	00-09 Active
 	10-19 Boom (14 actual fire frame)
 	20-29 Idle1
 	30-39 Idle2
 	40-49 Idle3
 	50-55 Away
-	*/
+*/
+void Weapon_A2k (edict_t *ent)
+{
 	static int	pause_frames[]	= {20, 30, 40, 0};
 	static int	fire_frames[]	= {14, 19, 0};
 
+	if (!ent)
+	{
+		return;
+	}
+
 	Weapon_Generic (ent, 9, 19, 49, 55, pause_frames, fire_frames, weapon_a2k_fire);
 }
 
@@ -1414,6 +1571,10 @@ qboolean push_hit (edict_t *self, vec3_t start, vec3_t aim, int damage, int kick
 	vec3_t end;
 	vec3_t v;
 
+	if (!self) {
+		return false;
+	}
+
 	//see if enemy is in range
 	VectorMA(start, 64, aim, end);
 	tr = gi.trace(start, NULL, NULL, end, self, MASK_SHOT);
@@ -1457,6 +1618,11 @@ qboolean push_hit (edict_t *self, vec3_t start, vec3_t aim, int damage, int kick
 
 void Action_Push (edict_t *ent)
 {
+	if (!ent)
+	{
+		return;
+	}
+
 	if (ent->client->ps.gunframe == 0)
 	{
 		ent->client->ps.gunframe++;