diff --git a/code/modules/lighting/lighting_turf.dm b/code/modules/lighting/lighting_turf.dm
index 3ab854a26f..d6cd0acdc8 100644
--- a/code/modules/lighting/lighting_turf.dm
+++ b/code/modules/lighting/lighting_turf.dm
@@ -111,7 +111,7 @@
 		return
 	directional_opacity = NONE
 	for(var/atom/movable/opacity_source as anything in opacity_sources)
-		if(opacity_source.flags & ON_BORDER)
+		if(opacity_source && opacity_source.flags & ON_BORDER)
 			directional_opacity |= opacity_source.dir
 		else //If fulltile and opaque, then the whole tile blocks view, no need to continue checking.
 			directional_opacity = ALL_CARDINALS