From da9ba25067c08190d9a915bb3255529d26be6b3c Mon Sep 17 00:00:00 2001
From: Yamagi Burmeister <yamagi@yamagi.org>
Date: Tue, 27 Sep 2011 16:08:55 +0000
Subject: [PATCH] Add a sanity check to prevent a potential crash

---
 src/game/baseq2/g_ai.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/game/baseq2/g_ai.c b/src/game/baseq2/g_ai.c
index 4be78d31..1d2fff23 100644
--- a/src/game/baseq2/g_ai.c
+++ b/src/game/baseq2/g_ai.c
@@ -308,6 +308,11 @@ visible(edict_t *self, edict_t *other)
 	vec3_t spot2;
 	trace_t trace;
 
+	if (!self || !other)
+	{
+		return false;
+	}
+
 	VectorCopy(self->s.origin, spot1);
 	spot1[2] += self->viewheight;
 	VectorCopy(other->s.origin, spot2);
@@ -333,7 +338,7 @@ infront(edict_t *self, edict_t *other)
 	float dot;
 	vec3_t forward;
 
-	if ((self == NULL) || (other == NULL))
+	if (!self || !other)
 	{
 		return false;
 	}