I clicked the maximize button when the movie was playing.And then crash!

virtual void CreateScreen()
{
FLoadingScreenAttributes loadingMovies;
//loadingMovies.bAllowInEarlyStartup = true;
loadingMovies.bAutoCompleteWhenLoadingCompletes = false;
loadingMovies.MoviePaths.Add(TEXT(“LoadingScreen”));

		GetMoviePlayer()->SetupLoadingScreen(loadingMovies);
	}