Stuck on saving game

[wallmachine]

Object reference not set to an instance of an object.

App:     LaunchBox
Version: 11.15
Type:    System.NullReferenceException
Site:    System.Object DefineSimpleProperty(System.Object)
Source:  LaunchBox

   at Unbroken.LaunchBox.Windows.Desktop.MenuActions.ImportRomFilesMenuAction.DefineSimpleProperty(Object )
   at Unbroken.LaunchBox.Windows.Desktop.MenuActions.ImportRomFilesMenuAction.Finish(RomImportTask task)
   at ResolverContainer.DeleteInvalidConfiguration(RomImportTask task, ResolverContainer )
   at Unbroken.LaunchBox.Windows.Desktop.MenuActions.ImportRomFilesMenuAction.<>c__DisplayClass1_0.ValidateAspectMethod()
   at Unbroken.LaunchBox.Windows.Threading.<>c__DisplayClass0_0.MoveInterfaceObserver()
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location where exception was thrown ---
   at System.Threading.ThreadHelper.ThreadStart()

Recent Log:

   6:05:44 PM Exception