Untitled

// add timer to keep it from crashing when waiting on MainWindow
private void NotifyLoaded(bool loaded)
{
    IsModelLoaded = loaded;

    var timer = new DispatcherTimer { Interval = TimeSpan.FromMilliseconds(100) };
    timer.Tick += (sender, e) =>
    {
        var mainWindow = Application.Current.MainWindow as MainWindow;
        if (mainWindow != null)
        {
            mainWindow.Dispatcher.BeginInvoke(new Action(() =>
            {
                if (AppConfig.Current.ToggleState.GlobalActive)
                    mainWindow.SetActive(loaded);
                mainWindow.CallPropertyChanged(nameof(mainWindow.IsModelLoaded));
            }));

            timer.Stop();
        }
    };
    timer.Start();
}