Lyrics plugin error "object of type 'NoneType' has no len()"

[2V3EvG4LMJFdRe]

Problem

beet lyrics was left running for a while, worked fine until it stopped at some unidentified song that triggered:

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.7/bin/beet", line 8, in <module>
    sys.exit(main())
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/beets/ui/__init__.py", line 1291, in main
    _raw_main(args)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/beets/ui/__init__.py", line 1278, in _raw_main
    subcommand.func(lib, suboptions, subargs)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/beetsplug/lyrics.py", line 792, in func
    opts.force_refetch or self.config['force'],
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/beetsplug/lyrics.py", line 889, in fetch_item_lyrics
    lyrics = [self.get_lyrics(artist, title) for title in titles]
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/beetsplug/lyrics.py", line 889, in <listcomp>
    lyrics = [self.get_lyrics(artist, title) for title in titles]
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/beetsplug/lyrics.py", line 922, in get_lyrics
    lyrics = backend.fetch(artist, title)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/beetsplug/lyrics.py", line 347, in fetch
    self.fetch_url(hit["result"]["url"]))
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/beetsplug/lyrics.py", line 376, in _scrape_lyrics_from_html
    html = BeautifulSoup(html, "html.parser")
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/bs4/__init__.py", line 310, in __init__
    elif len(markup) <= 256 and (
TypeError: object of type 'NoneType' has no len()

Setup

• OS: macOS High Sierra
• Python version: 3.7
• beets version: 1.5.0

Relevant issue: #479

[2V3EvG4LMJFdRe]

No one else has this? Should I run some version so that it doesn't happen?

lyrics:
    auto: yes
    force: yes
    sources: genius musixmatch lyricwiki google
    google_API_key: redacted
    fallback: ''
    import.write: yes

[wisp3rwind]

No, this seems to be an actual bug, the fix from #480 apparently either got lost or didn't apply to all lyrics sources in the first place. I'll have a try at fixing this.

This probably didn't show up before because it only manifests when the lyrics provider's server is unreachable. If your connection is down entirely, that would show up much quicker.

[2V3EvG4LMJFdRe]

Thanks a lot, hopefully you can get it. I could have posted the verbose log, but I'm going through my music year by year and the error shows up a solid hour into the process or so. Sometimes it doesn't show up at all.