Traceback (most recent call last):
  File "/usr/share/exaile/xl/xlmisc.py", line 1756, in notify
    self.func()
  File "/usr/bin/exaile", line 1091, in timer_update
    rating="rating + 1")
  File "/usr/bin/exaile", line 1170, in update_rating
    (track.loc,))[0]
TypeError: 'NoneType' object is unsubscriptable