diff --git a/code/ZAS/FEA_system.dm b/code/ZAS/FEA_system.dm
index 4434d9d2d40..6912102a93d 100644
--- a/code/ZAS/FEA_system.dm
+++ b/code/ZAS/FEA_system.dm
@@ -276,7 +276,7 @@ datum
 						rebuilds_to_consider[NT] = T
 
 			proc/ConsiderRebuild(var/turf/simulated/T, var/turf/NT)
-
+				if(!istype(T)) return
 				if(istype(NT, /turf/simulated) && NT.zone != T.zone)
 					T.zone.RemoveTurf(NT)
 					if(NT.zone)