diff --git a/code/datums/diseases/alien_embryo.dm b/code/datums/diseases/alien_embryo.dm
index e13b4875a01..8be2fa5c1c9 100644
--- a/code/datums/diseases/alien_embryo.dm
+++ b/code/datums/diseases/alien_embryo.dm
@@ -59,7 +59,7 @@
 			affected_mob.adjustToxLoss(10)
 			affected_mob.updatehealth()
 			if(prob(40))
-				ASSERT(gibbed == 0)
+				if(gibbed != 0) return 0
 				var/list/candidates = list() // Picks a random ghost in the world to shove in the larva -- TLE
 				for(var/mob/dead/observer/G in world)
 					if(G.client)
diff --git a/code/datums/diseases/robotic_transformation.dm b/code/datums/diseases/robotic_transformation.dm
index d68952d9a0b..34b074e34f4 100644
--- a/code/datums/diseases/robotic_transformation.dm
+++ b/code/datums/diseases/robotic_transformation.dm
@@ -52,7 +52,7 @@
 			affected_mob.adjustToxLoss(10)
 			affected_mob.updatehealth()
 			if(prob(40)) //So everyone can feel like robot Seth Brundle
-				ASSERT(src.gibbed == 0)
+				if(src.gibbed != 0) return 0
 				var/turf/T = find_loc(affected_mob)
 				gibs(T)
 				src.cure(0)
diff --git a/code/datums/diseases/xeno_transformation.dm b/code/datums/diseases/xeno_transformation.dm
index f3a822fb952..9d3289708ff 100644
--- a/code/datums/diseases/xeno_transformation.dm
+++ b/code/datums/diseases/xeno_transformation.dm
@@ -52,7 +52,7 @@
 			affected_mob.adjustToxLoss(10)
 			affected_mob.updatehealth()
 			if(prob(40))
-				ASSERT(gibbed == 0)
+				if(gibbed != 0) return 0
 				var/turf/T = find_loc(affected_mob)
 				gibs(T)
 				src.cure(0)
diff --git a/code/defines/procs/AStar.dm b/code/defines/procs/AStar.dm
index 988a3a2225f..d106e8f64fa 100644
--- a/code/defines/procs/AStar.dm
+++ b/code/defines/procs/AStar.dm
@@ -57,12 +57,12 @@ PriorityQueue
 				j >>= 1
 
 		Dequeue()
-			ASSERT(L.len)
+			if(!L.len) return 0
 			. = L[1]
 			Remove(1)
 
 		Remove(i)
-			ASSERT(i <= L.len)
+			if(i > L.len) return 0
 			L.Swap(i,L.len)
 			L.Cut(L.len)
 			if(i < L.len)
diff --git a/code/defines/procs/icon_procs.dm b/code/defines/procs/icon_procs.dm
index 3069645c828..16245997006 100644
--- a/code/defines/procs/icon_procs.dm
+++ b/code/defines/procs/icon_procs.dm
@@ -448,7 +448,7 @@ proc
 
 				currentLayer = current:layer
 				if(currentLayer<0) // Special case for FLY_LAYER
-					ASSERT(currentLayer > -1000)
+					if(currentLayer <= -1000) return 0
 					if(pSet == 0) // Underlay
 						currentLayer = A.layer+currentLayer/1000
 					else // Overlay
diff --git a/code/game/hud.dm b/code/game/hud.dm
index 1b4c2fae2d2..4d60c7d50ac 100644
--- a/code/game/hud.dm
+++ b/code/game/hud.dm
@@ -87,7 +87,7 @@ obj/hud/New(var/type = 0)
 /obj/hud/proc/instantiate(var/type = 0)
 
 	mymob = loc
-	ASSERT(istype(mymob, /mob))
+	if(!istype(mymob, /mob)) return 0
 
 	if(ishuman(mymob))
 		human_hud(mymob.UI) // Pass the player the UI style chosen in preferences
diff --git a/code/game/mecha/mech_fabricator.dm b/code/game/mecha/mech_fabricator.dm
index 9f9c9eee3e2..0bb8336a7f8 100644
--- a/code/game/mecha/mech_fabricator.dm
+++ b/code/game/mecha/mech_fabricator.dm
@@ -198,7 +198,7 @@
 				if(part)
 					parts[i] = part
 				//debug below
-				ASSERT(istype(parts[i],/obj/item))
+				if(!istype(parts[i],/obj/item)) return 0
 		return