Update turf_changing.dm

code/game/turfs/turf_changing.dm

@@ -61,29 +61,49 @@
 
 	cut_overlays(TRUE)
 	RemoveElement(/datum/element/turf_z_transparency)
-	changing_turf = TRUE
-	qdel(src)
 
-	var/turf/W = new N( locate(src.x, src.y, src.z) )
 	if(ispath(N, /turf/simulated/floor))
+		var/turf/simulated/W = new N( locate(src.x, src.y, src.z) )
 		if(old_fire)
-			W.fire = old_fire
-		W.RemoveLattice()
-	else if(old_fire)
-		old_fire.RemoveFire()
+			fire = old_fire
 
-	if(tell_universe)
-		universe.OnTurfChange(W)
+		if (istype(W,/turf/simulated/floor))
+			W.RemoveLattice()
 
-	if(air_master)
-		air_master.mark_for_update(W)
+		if(tell_universe)
+			universe.OnTurfChange(W)
 
-	for(var/turf/space/S in range(W, 1))
-		S.update_starlight()
-	W.levelupdate()
-	W.update_icon(1)
-	W.post_change()
-	. =  W
+		if(air_master)
+			air_master.mark_for_update(src) //handle the addition of the new turf.
+
+		for(var/turf/space/S in range(W,1))
+			S.update_starlight()
+
+		W.levelupdate()
+		W.update_icon(1)
+		W.post_change()
+		. = W
+
+	else
+
+		var/turf/W = new N( locate(src.x, src.y, src.z) )
+
+		if(old_fire)
+			old_fire.RemoveFire()
+
+		if(tell_universe)
+			universe.OnTurfChange(W)
+
+		if(air_master)
+			air_master.mark_for_update(src)
+
+		for(var/turf/space/S in range(W,1))
+			S.update_starlight()
+
+		W.levelupdate()
+		W.update_icon(1)
+		W.post_change()
+		. =  W
 
 	dangerous_objects = old_dangerous_objects
 
@@ -112,4 +132,4 @@
 			space_tile.update_starlight()
 
 	if(preserve_outdoors)
-		outdoors = old_outdoors
+		outdoors = old_outdoors