Traceback (most recent call last):
  File "/usr/share/software-center/softwarecenter/models/appstore.py", line 421, in on_get_value
    doc = self.db.get_xapian_document(app.appname, app.pkgname)
  File "/usr/share/software-center/softwarecenter/db/database.py", line 400, in get_xapian_document
    for m in self.xapiandb.postlist("AP"+pkgname):
  File "/usr/lib/python2.7/dist-packages/xapian/__init__.py", line 6656, in next
    return PostingItem(self)
  File "/usr/lib/python2.7/dist-packages/xapian/__init__.py", line 6583, in __init__
    self.doclength = iter._iter.get_doclength()
DocNotFoundError: Document 1393 not found