Version 13 destroy my huge scene.
!> Exception during Save: System.NullReferenceException: Object reference not set to an instance of an object
  at Slimy.ScreenTools.buttonClickA () [0x00000] in <filename unknown>:0 
  at Slimy.ScreenTools.OnBeforeSceneSave () [0x00000] in <filename unknown>:0 
  at (wrapper delegate-invoke) SuperController/OnSceneLoaded:invoke_void__this__ ()
  at (wrapper delegate-invoke) SuperController/OnSceneLoaded:invoke_void__this__ ()
  at (wrapper delegate-invoke) SuperController/OnSceneLoaded:invoke_void__this__ ()
  at (wrapper delegate-invoke) SuperController/OnSceneLoaded:invoke_void__this__ ()
  at (wrapper delegate-invoke) SuperController/OnSceneLoaded:invoke_void__this__ ()
  at (wrapper delegate-invoke) SuperController/OnSceneLoaded:invoke_void__this__ ()
  at SuperController.SaveInternalFinish (System.String saveName, .Atom specificAtom, Boolean includePhysical, Boolean includeAppearance, .ScreenShotCallback callback, Boolean isOverwrite) [0x00000] in <filename unknown>:0 
  at SuperController.SaveInternal (System.String saveName, .Atom specificAtom, Boolean includePhysical, Boolean includeAppearance, .ScreenShotCallback callback, Boolean isOverwrite, Boolean fromPlugin) [0x00000] in <filename unknown>:0
					
					
	
				 
				
				
					
is. I can't paste images in this review section, so I'll paste a screenshot in Discussion.