Traceback (most recent call last):
  File "/usr/share/software-center/softwarecenter/view/appdetailsview.py", line 125, in _on_cache_ready
    self.show_app(self.app)
  File "/usr/share/software-center/softwarecenter/view/appdetailsview_gtk.py", line 1456, in show_app
    self.app_details = app.get_details(self.db)
  File "/usr/share/software-center/softwarecenter/db/application.py", line 71, in get_details
    return AppDetails(db, application=self)
  File "/usr/share/software-center/softwarecenter/db/application.py", line 154, in __init__
    self._app.appname, self._app.pkgname)
  File "/usr/share/software-center/softwarecenter/db/database.py", line 290, in get_xapian_document
    doc = self.xapiandb.get_document(m.docid)
DocNotFoundError: Document 1960 not found.