diff --git a/OpenRA.Mods.D2k/Traits/Buildings/D2kActorPreviewPlaceBuildingPreview.cs b/OpenRA.Mods.D2k/Traits/Buildings/D2kActorPreviewPlaceBuildingPreview.cs
index a62055fa59..2cbdfecada 100644
--- a/OpenRA.Mods.D2k/Traits/Buildings/D2kActorPreviewPlaceBuildingPreview.cs
+++ b/OpenRA.Mods.D2k/Traits/Buildings/D2kActorPreviewPlaceBuildingPreview.cs
@@ -104,7 +104,7 @@ namespace OpenRA.Mods.D2k.Traits
 				if ((c.Value & filter) == 0)
 					continue;
 
-				var isUnsafe = checkUnsafeTiles && candidateSafeTiles.Contains(c.Key) && info.UnsafeTerrainTypes.Contains(wr.World.Map.GetTerrainInfo(c.Key).Type);
+				var isUnsafe = checkUnsafeTiles && wr.World.Map.Contains(c.Key) && candidateSafeTiles.Contains(c.Key) && info.UnsafeTerrainTypes.Contains(wr.World.Map.GetTerrainInfo(c.Key).Type);
 				var tile = (c.Value & PlaceBuildingCellType.Invalid) != 0 ? blockedTile : isUnsafe ? unsafeTile : validTile;
 				var sequenceAlpha = (c.Value & PlaceBuildingCellType.Invalid) != 0 ? blockedAlpha : isUnsafe ? unsafeAlpha : validAlpha;