diff --git a/source/games/blood/src/aibeast.cpp b/source/games/blood/src/aibeast.cpp
index 62d424095..3c09c1dbf 100644
--- a/source/games/blood/src/aibeast.cpp
+++ b/source/games/blood/src/aibeast.cpp
@@ -281,7 +281,7 @@ static void beastThinkChase(DBloodActor* actor)
 			if (nDist < pDudeInfo->seeDist && abs(nDeltaAngle) <= pDudeInfo->periphery)
 			{
 				aiSetTarget(actor, actor->GetTarget());
-				actor->dudeSlope = DivScale(pTarget->z - pSprite->z, nDist, 10);
+				actor->dudeSlope = nDist == 0? 0 : DivScale(pTarget->z - pSprite->z, nDist, 10);
 				if (nDist < 0x1400 && nDist > 0xa00 && abs(nDeltaAngle) < 85 && (pTarget->flags & 2)
 					&& IsPlayerSprite(pTarget) && Chance(0x8000))
 				{
diff --git a/source/games/blood/src/aicaleb.cpp b/source/games/blood/src/aicaleb.cpp
index b641a0864..83a7eed10 100644
--- a/source/games/blood/src/aicaleb.cpp
+++ b/source/games/blood/src/aicaleb.cpp
@@ -183,7 +183,7 @@ static void calebThinkChase(DBloodActor* actor)
 			if (nDist < pDudeInfo->seeDist && abs(nDeltaAngle) <= pDudeInfo->periphery)
 			{
 				aiSetTarget(actor, actor->GetTarget());
-				actor->dudeSlope = DivScale(pTarget->z - pSprite->z, nDist, 10);
+				actor->dudeSlope = nDist == 0 ? 0 : DivScale(pTarget->z-pSprite->z, nDist, 10);
 				if (nDist < 0x599 && abs(nDeltaAngle) < 28)
 				{
 					XSECTOR* pXSector;
diff --git a/source/games/blood/src/aicult.cpp b/source/games/blood/src/aicult.cpp
index 8ffece960..41308222b 100644
--- a/source/games/blood/src/aicult.cpp
+++ b/source/games/blood/src/aicult.cpp
@@ -297,7 +297,7 @@ static void cultThinkChase(DBloodActor* actor)
 			if (nDist < pDudeInfo->seeDist && abs(nDeltaAngle) <= pDudeInfo->periphery)
 			{
 				aiSetTarget(actor, actor->GetTarget());
-				actor->dudeSlope = DivScale(pTarget->z - pSprite->z, nDist, 10);
+				actor->dudeSlope = nDist == 0 ? 0 : DivScale(pTarget->z - pSprite->z, nDist, 10);
 				switch (pSprite->type) {
 				case kDudeCultistTommy:
 					if (nDist < 0x1e00 && nDist > 0xe00 && abs(nDeltaAngle) < 85 && !TargetNearExplosion(pTarget)
diff --git a/source/games/blood/src/aigilbst.cpp b/source/games/blood/src/aigilbst.cpp
index 2b25d15e1..f3e54c4a1 100644
--- a/source/games/blood/src/aigilbst.cpp
+++ b/source/games/blood/src/aigilbst.cpp
@@ -173,7 +173,7 @@ static void gillThinkChase(DBloodActor* actor)
 			if (nDist < pDudeInfo->seeDist && abs(nDeltaAngle) <= pDudeInfo->periphery)
 			{
 				aiSetTarget(actor, actor->GetTarget());
-				actor->dudeSlope = DivScale(pTarget->z - pSprite->z, nDist, 10);
+				actor->dudeSlope = nDist == 0 ? 0 : DivScale(pTarget->z - pSprite->z, nDist, 10);
 				if (nDist < 921 && abs(nDeltaAngle) < 28)
 				{
 					XSECTOR* pXSector;
diff --git a/source/games/blood/src/aiunicult.cpp b/source/games/blood/src/aiunicult.cpp
index 97663577e..ee414876f 100644
--- a/source/games/blood/src/aiunicult.cpp
+++ b/source/games/blood/src/aiunicult.cpp
@@ -568,7 +568,7 @@ static void unicultThinkChase(DBloodActor* actor)
         if ((PlayClock & 64) == 0 && Chance(0x3000) && !spriteIsUnderwater(actor, false))
             playGenDudeSound(actor, kGenDudeSndChasing);
 
-        actor->dudeSlope = DivScale(pTarget->z - pSprite->z, dist, 10);
+        actor->dudeSlope = dist == 0 ? 0 : DivScale(pTarget->z - pSprite->z, dist, 10);
 
         int curWeapon = actor->genDudeExtra().curWeapon; 
         int weaponType = actor->genDudeExtra().weaponType;