Bug: AppThemeBackgroundImageSource System.ArgumentException

[sentry]

Sentry Issue: FILES-APP-3P4

System.ArgumentException: The parameter is incorrect.

o is not a valid absolute URI.
  ?, in ObjectReferenceValue WinRTUriRuntimeClassFactory.CreateUriForMarshaling(string uri)
  ?, in ObjectReferenceValue Uri.CreateMarshaler2(Uri value)
  ?, in ImageSource MainPageViewModel.get_AppThemeBackgroundImageSource()
  ?, in void MainPage_obj1_Bindings.Update_ViewModel(MainPageViewModel obj, int phase)
  ?, in void MainPage_obj1_Bindings.Update_(MainPage obj, int phase)
...
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