Sanity plugs for two runtimes in lightning code

code/WorkInProgress/Aryn/Lighting/Engine.dm

@@ -171,9 +171,10 @@ turf/proc/ResetAllLights()
 
 /turf/space/ResetAllLights()
 	var/atom/movable/lighting_overlay/overlay = locate() in src
-	overlay.loc = null
-	light_overlay = null
-	is_outside = 1
+	if (overlay)
+		overlay.loc = null
+		light_overlay = null
+		is_outside = 1
 	. = ..()
 
 turf/proc/ResetValue()

code/WorkInProgress/Aryn/Lighting/Light.dm

@@ -48,6 +48,8 @@ light/proc/Off()
 	lit_turfs = list()
 
 light/proc/CalculateBrightness(turf/T)
+	if (!atom)
+		retun 0
 	var/square = get_square_dist(atom.x,atom.y,atom.z,T.x,T.y,T.z)
 	if(square > (radius+2)*(radius+2)) return 0
 		//+2 offset gives an ambient light effect.