Merge pull request #4896 from VOREStation/pol-qdels

Fix several Destoy()s

code/game/objects/items/devices/communicator/communicator.dm

@@ -287,17 +287,20 @@ var/global/list/obj/item/device/communicator/all_communicators = list()
 		to_chat(voice, "<span class='danger'>\icon[src] Connection timed out with remote host.</span>")
 		qdel(voice)
 	close_connection(reason = "Connection timed out")
+
+	//Clean up all references we might have to others
 	communicating.Cut()
 	voice_requests.Cut()
 	voice_invites.Cut()
+	node = null
+
+	//Clean up references that might point at us
 	all_communicators -= src
 	processing_objects -= src
 	listening_objects.Remove(src)
-	qdel(camera)
-	camera = null
-	if(exonet)
-		exonet.remove_address()
-		exonet = null
+	qdel_null(camera)
+	qdel_null(exonet)
+
 	return ..()
 
 // Proc: update_icon()

code/game/objects/items/weapons/implants/implant.dm

@@ -52,7 +52,9 @@
 /obj/item/weapon/implant/Destroy()
 	if(part)
 		part.implants.Remove(src)
+	listening_objects.Remove(src)
 	part = null
+	imp_in = null
 	return ..()
 
 /obj/item/weapon/implant/attackby(obj/item/I, mob/user)
@@ -82,7 +84,6 @@
 
 /obj/item/weapon/implant/tracking/implanted(var/mob/source)
 	processing_objects.Add(src)
-	listening_objects |= src
 	return 1
 
 /obj/item/weapon/implant/tracking/Destroy()