diff --git a/OpenRA.Mods.RA/Buildings/Building.cs b/OpenRA.Mods.RA/Buildings/Building.cs
index 85d27ad1e6..5ead5ea237 100755
--- a/OpenRA.Mods.RA/Buildings/Building.cs
+++ b/OpenRA.Mods.RA/Buildings/Building.cs
@@ -82,7 +82,7 @@ namespace OpenRA.Mods.RA.Buildings
 				{
 				    var pos = new CPos(x, y);
 					var at = bi.GetBuildingAt(pos);
-					if (at == null || !at.HasTrait<GivesBuildableArea>())
+					if (at == null || !at.IsInWorld || !at.HasTrait<GivesBuildableArea>())
 						continue;
 
 					if (at.Owner == p || (allyBuildRadius && at.Owner.Stances[p] == Stance.Ally))