Error with XTube: AttributeError: 'NoneType' object has no attribute 'items'

[well1920]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2020.03.08
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar issues including closed ones

Verbose log

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-v', u'http://www.xtube.com/video-watch/strange-erotica-625837']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2020.03.08
[debug] Python version 2.7.17 (CPython) - Linux-4.15.0-88-generic-x86_64-with-Ubuntu-18.04-bionic
[debug] exe versions: ffmpeg 3.4.6, ffprobe 3.4.6, phantomjs 9913, rtmpdump 2.4
[debug] Proxy map: {}
[XTube] strange-erotica: Downloading 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 474, in main
    _real_main(argv)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/__init__.py", line 464, in _real_main
    retcode = ydl.download(all_urls)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/YoutubeDL.py", line 2019, 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 797, in extract_info
    ie_result = ie.extract(url)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/common.py", line 530, in extract
    ie_result = self._real_extract(url)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/xtube.py", line 110, in _real_extract
    for format_id, format_url in sources.items():
AttributeError: 'NoneType' object has no attribute 'items'

Description

This error appears when trying to download a video from XTube. The example URL included in youtube_dl/extractor/xtube.py was used, but the same error occurs with other videos. Up until a few days ago this was working fine. Videos from other sites like YouTube work. Using fully updated Ubuntu 18.04 with the latest youtube-dl installed via pip.