fixes #323

OpenRA.Mods.Cnc/Missions/Gdi01Script.cs

@@ -196,7 +196,8 @@ namespace OpenRA.Mods.Cnc
 					{
 						var b = cargo.Unload(a);
 						world.AddFrameEndTask(w2 =>
-						{
+						{
+							if (b.Destroyed) return;
 							w2.Add(b);
 							b.TraitsImplementing<IMove>().FirstOrDefault().SetPosition(b, a.Location);
 							b.QueueActivity(new Move(unload, 2));

OpenRA.Mods.Cnc/TiberiumRefineryDockAction.cs

@@ -56,7 +56,8 @@ namespace OpenRA.Mods.Cnc
 						harv.QueueActivity( new Move(harvester.LastHarvestedCell, 5) );
 						if (harv.Owner == self.World.LocalPlayer)
 							self.World.AddFrameEndTask( w =>
-							{
+							{
+								if (harv.Destroyed) return;
 								var line = harv.TraitOrDefault<DrawLineToTarget>();
 								if (line != null)
 									line.SetTargetSilently(harv, Target.FromCell(harvester.LastHarvestedCell), Color.Green);