An exception occurs if you select "Add episodes" to add episodes to the playlist and then select cancel while they're being added.
The message in the dialog box is "There was an error generating your playlist: net.marcus....podtrapper.ui.foreground.OperationInteruptedException/Cancelled"
If you select OK to acknowledge the exception you're returned to the playlist, the app does *not* crash, so, this is pretty minor.
Thanks,
Gordon