A few fixes.

code/ZAS/Connection.dm

@@ -190,6 +190,9 @@ connection
 		return 1
 
 	proc/UpdateZones() //Changes connection data in the zones if it is required.
+		if(istype(A,/turf/space) || istype(B,/turf/space))
+			src.Cleanup()
+			return
 		if(A.ZAirPass(B))
 			var/door_pass = A.CanPass(null,B,1.5,1)
 			if(door_pass || A.CanPass(null,B,0,0))

code/game/objects/effect_system.dm

@@ -195,7 +195,7 @@ steam.start() -- spawns the effect
 			if(src.total_sparks > 20)
 				return
 			spawn(0)
-				if(holder)
+				if(holder || !istype(holder,/datum))
 					src.location = get_turf(holder)
 				var/obj/effect/effect/sparks/sparks = new /obj/effect/effect/sparks(src.location)
 				src.total_sparks++

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

@@ -114,8 +114,7 @@
 	..()
 
 /obj/item/weapon/implanter/compressed/afterattack(atom/A, mob/user as mob)
-	if(istype(A,/obj/item))
-		var/obj/item/weapon/implant/compressed/c = imp
-		c.scanned = A
+	if(istype(A,/obj/item) && imp)
+		imp:scanned = A
 		A.loc.contents.Remove(A)
 		update()

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

@@ -253,7 +253,7 @@
 			if (timeleft)
 				stat(null, "ETA-[(timeleft / 60) % 60]:[add_zero(num2text(timeleft % 60), 2)]")
 
-		if(ticker.mode.name == "AI malfunction")
+		if(ticker.mode && ticker.mode.name == "AI malfunction")
 			var/datum/game_mode/malfunction/malf = ticker.mode
 			for (var/datum/mind/malfai in malf.malf_ai)
 				if(connected_ai)