MusicBrainz 400 Bad Request when uplading a track

Steps to reproduce

1. Upload a file (In this case AURORA's Runaway)

What happens?

Track errors, with the following traceback:

2019-04-15 00:16:27,461 ERROR    Internal Server Error: /api/v1/tracks/1891/lyrics/
Traceback (most recent call last):
  File "/srv/funkwhale/virtualenv/lib/python3.5/site-packages/musicbrainzngs/musicbrainz.py", line 480, in _safe_read
    f = opener.open(req)
  File "/usr/lib/python3.5/urllib/request.py", line 472, in open
    response = meth(req, response)
  File "/usr/lib/python3.5/urllib/request.py", line 582, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/lib/python3.5/urllib/request.py", line 510, in error
    return self._call_chain(*args)
  File "/usr/lib/python3.5/urllib/request.py", line 444, in _call_chain
    result = func(*args)
  File "/usr/lib/python3.5/urllib/request.py", line 590, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 400: Bad Request
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "/srv/funkwhale/virtualenv/lib/python3.5/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/srv/funkwhale/virtualenv/lib/python3.5/site-packages/django/core/handlers/base.py", line 126, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/srv/funkwhale/virtualenv/lib/python3.5/site-packages/django/core/handlers/base.py", line 124, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/usr/lib/python3.5/contextlib.py", line 30, in inner
    return func(*args, **kwds)
  File "/srv/funkwhale/virtualenv/lib/python3.5/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view
    return view_func(*args, **kwargs)
  File "/srv/funkwhale/virtualenv/lib/python3.5/site-packages/rest_framework/viewsets.py", line 116, in view
    return self.dispatch(request, *args, **kwargs)
  File "/srv/funkwhale/virtualenv/lib/python3.5/site-packages/rest_framework/views.py", line 495, in dispatch
    response = self.handle_exception(exc)
  File "/srv/funkwhale/virtualenv/lib/python3.5/site-packages/rest_framework/views.py", line 455, in handle_exception
    self.raise_uncaught_exception(exc)
  File "/srv/funkwhale/virtualenv/lib/python3.5/site-packages/rest_framework/views.py", line 492, in dispatch
    response = handler(request, *args, **kwargs)
  File "./funkwhale_api/music/views.py", line 208, in lyrics
    work = track.get_work()
  File "./funkwhale_api/music/models.py", line 514, in get_work
    data = self.api.get(self.mbid, includes=["work-rels"])
  File "/srv/funkwhale/virtualenv/lib/python3.5/site-packages/memoize/func.py", line 91, in __call__
    return self.cache.get(self.key(args, copy_kwargs), self.func, args, kwargs, **self.opts)
  File "/srv/funkwhale/virtualenv/lib/python3.5/site-packages/memoize/core.py", line 116, in get
    value = func(*args, **kwargs)
  File "/srv/funkwhale/virtualenv/lib/python3.5/site-packages/musicbrainzngs/musicbrainz.py", line 857, in get_recording_by_id
    return _do_mb_query("recording", id, includes, params)
  File "/srv/funkwhale/virtualenv/lib/python3.5/site-packages/musicbrainzngs/musicbrainz.py", line 711, in _do_mb_query
    return _mb_request(path, 'GET', auth_required, args=args)
  File "/srv/funkwhale/virtualenv/lib/python3.5/site-packages/musicbrainzngs/musicbrainz.py", line 400, in __call__
    return self.fun(*args, **kwargs)
  File "/srv/funkwhale/virtualenv/lib/python3.5/site-packages/musicbrainzngs/musicbrainz.py", line 673, in _mb_request
    resp = _safe_read(opener, req, body)
  File "/srv/funkwhale/virtualenv/lib/python3.5/site-packages/musicbrainzngs/musicbrainz.py", line 486, in _safe_read
    raise ResponseError(cause=exc)
musicbrainzngs.musicbrainz.ResponseError: caused by: HTTP Error 400: Bad Request

What is expected?

Track should get processed, as the ID3 tags are correct (and other tracks in the same album, also tagged by Picard work just fine)

Context

Funkwhale version(s) affected: 0.18.3

Instance configuration: Non-docker, Nginx