lists

code/game/objects/items/devices/PDA/cart.dm

@@ -500,7 +500,7 @@
 		if(!CbotData.len)
 			CbotData[++CbotData.len] = list("x" = 0, "y" = 0, dir=null, status = null)
 		var/CartData[0]
-		for(var/obj/structure/janitorialcart/B in world)
+		for(var/obj/structure/janitorialcart/B in janitorialcarts)
 			var/turf/bl = get_turf(B)
 			if(bl)
 				if(bl.z != cl.z)

code/game/objects/structures/janicart.dm

@@ -232,8 +232,13 @@
 
 /obj/structure/janitorialcart/New()
 	create_reagents(100)
+	janitorialcarts += src
 
 
+/obj/structure/janitorialcart/Destroy()
+	janitorialcarts -= src
+	return ..()
+
 /obj/structure/janitorialcart/proc/wet_mop(obj/item/weapon/mop, mob/user)
 	if(reagents.total_volume < 1)
 		user << "[src] is out of water!</span>"