Mutagen Exception for skipping files in URI list file

[cukabeka]

So, as I tried the workaround for the workaround as suggested by @ramonskie in #25 (comment)_ (and it worked, thanks! 🙌 ), I could use a uri_list.txt successfully.
Now the process was aborted due to a wifi error locally, and now I can't restart the process in the same directory. I get the error below:

Exception in thread SpotifyRipperThread:
Traceback (most recent call last):
  File "/usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/lib/python3.7/threading.py", line 917, in _bootstrap_inner
    self.run()
  File "/usr/local/lib/python3.7/site-packages/spotify_ripper/ripper.py", line 241, in run
    self.progress.calc_total(all_tracks)
  File "/usr/local/lib/python3.7/site-packages/spotify_ripper/progress.py", line 76, in calc_total
    not is_partial(audio_file, track):
  File "/usr/local/lib/python3.7/site-packages/spotify_ripper/utils.py", line 446, in is_partial
    audio_file_dur = audio_file_duration(audio_file)
  File "/usr/local/lib/python3.7/site-packages/spotify_ripper/utils.py", line 441, in audio_file_duration
    _file = mutagen.File(audio_file)
  File "/usr/local/lib/python3.7/site-packages/mutagen/_file.py", line 235, in File
    return Kind(filename)
  File "/usr/local/lib/python3.7/site-packages/mutagen/_file.py", line 41, in __init__
    self.load(filename, *args, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/mutagen/id3/__init__.py", line 1084, in load
    self.info = self._Info(fileobj, offset)
  File "/usr/local/lib/python3.7/site-packages/mutagen/mp3.py", line 185, in __init__
    self.__try(fileobj, offset, size - offset, False)
  File "/usr/local/lib/python3.7/site-packages/mutagen/mp3.py", line 223, in __try
    raise HeaderNotFoundError("can't sync to an MPEG frame")
mutagen.mp3.HeaderNotFoundError: can't sync to an MPEG frame

If I trigger the action in a blank directory without files, it works perfectly (but downloads all files again..). Any idea how this error can happen and could be prevented?