Map editor crashes when you press + hold Z

[the guy thats not good]

Whenever i press and hold Z or "undo" something but i hold the button, it blue screens the map editor and crashes.
The crash report reads:

Superfighters Deluxe Pre-Alpha v.1.9.0 - Unhandled Error
Status: Editor, False, Editor
GraphicsDeviceStatus: Normal

Error: ProcessMapEditorCommands failed.
System.Exception: Error: Could not process command ShowProperties
System.NullReferenceException: Object reference not set to an instance of an object.
at SFD.MapEditor.SFDMapEditor.SetPropertiesPanel(List`1 properties)
at SFD.MapEditor.SFDMapEditor.MapEditorGUICommand(MapEditorGUICommands command, Object[] args)
at SFD.MapEditor.SFDMapEditor.MapEditorGUICommand(MapEditorGUICommands command, Object[] args)
at SFD.States.StateEditor.ProcessMapEditorCommands(Double elapsedGameTime)
> Exception:
Error:
> StackTrace:

> FullException:
System.Exception: Error:


Additional data
arch:x86, archWOW:AMD64
OS:Microsoft Windows NT 6.2.9200.0
UTD:False

i tried to force update the game, but it still occurs.

[Gurt]

Fixed in Pre-Alpha 1.9.0b