AttributeError: 'NoneType' object has no attribute 'group'

Sentry Issue: SICKRAGE-APP-749

AttributeError: 'NoneType' object has no attribute 'group'
  File "subliminal/core.py", line 115, in list_subtitles_provider
    return self[provider].list_subtitles(video, provider_languages)
  File "sickrage/subtitles/providers/subscene.py", line 166, in list_subtitles
    return [s for s in self.query(video.series, video.season, video.episode)
  File "sickrage/subtitles/providers/subscene.py", line 148, in query
    sub_id = re.search(r'\?mac=(.*)', soup2.find('a', id='downloadButton')['href']).group(1)

Unexpected error. Provider subscene