Traceback (most recent call last):
  File "/usr/share/software-center/softwarecenter/ui/gtk3/views/appdetailsview.py", line 1836, in _on_cache_ready
    self.show_app(self.app)
  File "/usr/share/software-center/softwarecenter/ui/gtk3/views/appdetailsview.py", line 1734, in show_app
    self.app_details = app.get_details(self.db)
  File "/usr/share/software-center/softwarecenter/db/debfile.py", line 60, in get_details
    details = AppDetailsDebFile(db, application=self)
  File "/usr/share/software-center/softwarecenter/db/debfile.py", line 118, in __init__
    if not self._deb.check():
  File "/usr/lib/python2.7/dist-packages/apt/debfile.py", line 513, in check
    if not self.check_conflicts():
  File "/usr/lib/python2.7/dist-packages/apt/debfile.py", line 357, in check_conflicts
    if self._check_conflicts_or_group(or_group):
  File "/usr/lib/python2.7/dist-packages/apt/debfile.py", line 266, in _check_conflicts_or_group
    depname, in_conflict_checking=True)
  File "/usr/lib/python2.7/dist-packages/apt/debfile.py", line 125, in _maybe_append_multiarch_suffix
    cand = self._cache[multiarch_pkgname].candidate._cand
AttributeError: 'NoneType' object has no attribute '_cand'