Everything can be gone by the time this spawn ends

Maybe this should be a timer with a callback,
but it sure is a lot of logic to handle that

code/modules/food/food/snacks.dm

@@ -1014,7 +1014,9 @@
 
 /obj/item/weapon/reagent_containers/food/snacks/donkpocket/proc/cooltime()
 	if (src.warm)
-		spawn(4200)
+		spawn(420 SECONDS)
+			if(!src?.reagents)
+				return
 			src.warm = 0
 			for(var/reagent in heated_reagents)
 				src.reagents.del_reagent(reagent)