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code/modules/mob/living/living.dm

@@ -295,7 +295,7 @@
 		if(!iscarbon(src))
 			M.LAssailant = null
 		else
-			M.LAssailant = usr
+			M.LAssailant = WEAKREF(src)
 		if(isliving(M))
 			var/mob/living/L = M
 			//Share diseases that are spread by touch

code/modules/mob/living/simple_animal/slime/life.dm

@@ -186,12 +186,13 @@
 	if(M.stat == DEAD) // our victim died
 		if(!client)
 			if(!rabid && !attacked)
-				if(M.LAssailant && M.LAssailant != M)
+				var/mob/living/carbon/their_attacker = M.getLAssailant()
+				if(their_attacker != M)
 					if(prob(50))
-						if(!(M.LAssailant in Friends))
-							Friends[M.LAssailant] = 1
+						if(!(their_attacker in Friends))
+							Friends[their_attacker] = 1
 						else
-							++Friends[M.LAssailant]
+							++Friends[their_attacker]
 		else
 			to_chat(src, "<i>This subject does not have a strong enough life energy anymore...</i>")
 

code/modules/mob/mob.dm

@@ -952,3 +952,6 @@ GLOBAL_VAR_INIT(exploit_warn_spam_prevention, 0)
 /mob/setMovetype(newval)
 	. = ..()
 	update_movespeed(FALSE)
+
+/mob/proc/getLAssailant()
+	return LAssailant?.resolve()

code/modules/mob/mob_defines.dm

@@ -80,8 +80,8 @@
 	var/list/faction = list("neutral") //A list of factions that this mob is currently in, for hostile mob targetting, amongst other things
 	var/move_on_shuttle = 1 // Can move on the shuttle.
 
-//The last mob/living/carbon to push/drag/grab this mob (mostly used by slimes friend recognition)
-	var/mob/living/carbon/LAssailant = null
+	/// The last mob/living/carbon to push/drag/grab this mob (mostly used by slimes friend recognition)
+	var/datum/weakref/LAssailant
 
 	var/list/obj/user_movement_hooks	//Passes movement in client/Move() to these!