TypeError: (int) argument must be a string or a number, not 'list'

[github-userx]

Using the latest version of youtube-dl on debian, installed via pip (python2.7).

I have given ytdl a .txt with URL's that are all working but it always gives me this error after having downloaded 90% of the URL's. If I remove the URL from the list where ytdl gave the error, next time the same error occurs but the download just stops at different URL.

[download] video-01 has already been recorded in archive
[PornHub] phXXXXXXXXXX: Downloading pc webpage
[download] video-02 has already been recorded in archive
[PornHub] phXXXXXXXXXX: Downloading pc webpage
Traceback (most recent call last):
File "/usr/local/bin/youtube-dl", line 11, in <module>
sys.exit(main())
File "/usr/local/lib/python2.7/dist-packages/youtube_dl/__init__.py", line 472, in main
_real_main(argv)
File "/usr/local/lib/python2.7/dist-packages/youtube_dl/__init__.py", line 462, in _real_main
retcode = ydl.download(all_urls)
File "/usr/local/lib/python2.7/dist-packages/youtube_dl/YoutubeDL.py", line 2006, in download
url, force_generic_extractor=self.params.get('force_generic_extractor', False))
File "/usr/local/lib/python2.7/dist-packages/youtube_dl/YoutubeDL.py", line 794, in extract_info
ie_result = ie.extract(url)
File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/common.py", line 529, in extract
ie_result = self._real_extract(url)
File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/pornhub.py", line 225, in _real_extract
(video_url, int_or_none(definition.get('quality'))))
File "/usr/local/lib/python2.7/dist-packages/youtube_dl/utils.py", line 1924, in int_or_none
return int(v) * invscale // scale
TypeError: int() argument must be a string or a number, not 'list'
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