prerelease

Editor/ESEditor/EngineStreamEditor.cs

@@ -81,6 +81,11 @@ internal sealed class EngineStreamEditor : Widget, IAssetInspector
 			picker.OnAssetPicked += asset => CreateStreamEditor( asset[0].LoadResource<EngineStream>() );
 			picker.Show();
 		};
+		var saveButton = a.Add( new Button( "Save File" ), 0 );
+		saveButton.Clicked = () =>
+		{
+			ActiveStream.StateHasChanged();
+		};
 	}
 	Layout RightLayout;
 	SimulatedEngineWidget SimulatedEngineWidget;

Editor/ESEditor/SimulatedEngineWidget.cs

@@ -76,7 +76,7 @@ internal sealed class SimulatedEngineWidget : Widget
 	[EditorEvent.Frame]
 	public void OnFrame()
 	{
-		if ( Player.Stream is null )
+		if ( Player is null || !Player.Stream.IsValid() )
 			return;
 		Player.EngineState = IsPlaying ? EngineState.Running : EngineState.Off;
 
@@ -85,7 +85,7 @@ internal sealed class SimulatedEngineWidget : Widget
 		IsRedlining = RPM.Value == 1 && !IsRedlining;
 		Player.IsRedlining = IsRedlining;
 
-		Player.Update( Time.Delta, Vector3.Zero, true );
+		Player?.Update( Time.Delta, Vector3.Zero, true );
 
 	}
 }