Uses more QDEL_NULLs

code/modules/mob/living/silicon/robot/robot.dm

@@ -1206,8 +1206,7 @@ var/list/robot_verbs_default = list(
 	scrambledcodes = 1
 	//Disconnect it's camera so it's not so easily tracked.
 	if(src.camera)
-		qdel(src.camera)
-		src.camera = null
+		QDEL_NULL(src.camera)
 		// I'm trying to get the Cyborg to not be listed in the camera list
 		// Instead of being listed as "deactivated". The downside is that I'm going
 		// to have to check if every camera is null or not before doing anything, to prevent runtime errors.

code/modules/mob/living/simple_animal/bot/cleanbot.dm

@@ -167,9 +167,8 @@
 	mode = BOT_CLEANING
 	spawn(50)
 		if(mode == BOT_CLEANING)
-			qdel(target)
+			QDEL_NULL(target)
 			anchored = 0
-			target = null
 		mode = BOT_IDLE
 		icon_state = "cleanbot[on]"
 
@@ -222,4 +221,4 @@ text("<A href='?src=[UID()];power=1'>[on ? "On" : "Off"]</A>"))
 	if(istype(A,/obj/effect/decal/cleanable))
 		clean(A)
 	else
-		..()
+		..()