TypeError: can't compare offset-naive and offset-aware datetimes

I try to generate a poster with some gpx files extracted from my garmin account. I have downloaded the files using the proposed python script garmin-connect-export. Now, I get the following error:

Traceback (most recent call last):
  File "~/GpxTrackPoster/venv/bin/create_poster", line 8, in <module>
    sys.exit(main())
  File "~/GpxTrackPoster/venv/lib/python3.7/site-packages/gpxtrackposter/cli.py", line 217, in main
    tracks = loader.load_tracks(args.gpx_dir)
  File "~/GpxTrackPoster/venv/lib/python3.7/site-packages/gpxtrackposter/track_loader.py", line 114, in load_tracks
    return self._filter_and_merge_tracks(tracks)
  File "~/GpxTrackPoster/venv/lib/python3.7/site-packages/gpxtrackposter/track_loader.py", line 169, in _filter_and_merge_tracks
    tracks = self._merge_tracks(tracks)
  File "~/GpxTrackPoster/venv/lib/python3.7/site-packages/gpxtrackposter/track_loader.py", line 176, in _merge_tracks
    tracks = sorted(tracks, key=lambda t1: t1.start_time())
TypeError: can't compare offset-naive and offset-aware datetimes

Is something wrong with my gpx files? As said, they all come from the same source.

Thanks in advance, LT.

[lowtower]

Thanks for Your quick reply!

The modification did work! I get some errors for only a few gpx files such as:

Error while loading ~/2020/activity_5702364393.gpx: Track has no start or end time.

I have to have a closer look at these files.

Thanks a lot, cheers, LT

[lowtower]

I checked the relevant gpx files - they were not “running” files but “cardio” without time info - so the error messages are reasonable.

Thanks for Your help and filing the pr!