diff --git a/OpenRA.Game/Map/Map.cs b/OpenRA.Game/Map/Map.cs
index 19148d4405..50fa077c32 100644
--- a/OpenRA.Game/Map/Map.cs
+++ b/OpenRA.Game/Map/Map.cs
@@ -768,7 +768,12 @@ namespace OpenRA
 			if (Grid.MaximumTerrainHeight == 0)
 				return Contains((PPos)uv);
 
-			foreach (var puv in ProjectedCellsCovering(uv))
+			// If the cell has no valid projection, then we're off the map.
+			var projectedCells = ProjectedCellsCovering(uv);
+			if (projectedCells.Length == 0)
+				return false;
+
+			foreach (var puv in projectedCells)
 				if (!Contains(puv))
 					return false;
 			return true;
diff --git a/OpenRA.Game/Traits/Player/FrozenActorLayer.cs b/OpenRA.Game/Traits/Player/FrozenActorLayer.cs
index 3b2ce7709e..494a7bb699 100644
--- a/OpenRA.Game/Traits/Player/FrozenActorLayer.cs
+++ b/OpenRA.Game/Traits/Player/FrozenActorLayer.cs
@@ -65,17 +65,15 @@ namespace OpenRA.Traits
 				.ToArray();
 
 			if (Footprint.Length == 0)
-				throw new ArgumentException(("This frozen actor has no footprint! Please report a bug!\n" +
+				throw new ArgumentException(("This frozen actor has no footprint.\n" +
 					"Actor Name: {0}\n" +
 					"Actor Location: {1}\n" +
 					"Input footprint: [{2}]\n" +
-					"Input footprint (shroud.Contains): [{3}]\n" +
-					"Input footprint (map.Contains): [{4}]")
+					"Input footprint (after shroud.Contains): [{3}]")
 					.F(actor.Info.Name,
 					actor.Location.ToString(),
 					footprint.Select(p => p.ToString()).JoinWith("|"),
-					footprint.Select(p => shroud.Contains(p).ToString()).JoinWith("|"),
-					footprint.Select(p => actor.World.Map.Contains(p).ToString()).JoinWith("|")));
+					footprint.Select(p => shroud.Contains(p).ToString()).JoinWith("|")));
 
 			CenterPosition = self.CenterPosition;
 			Bounds = self.Bounds;