update-apt-xapian-index crashed with AttributeError in index(): class CustomKeys has no attribute 'CATEGORY'

[Robert Roth]

Binary package hint: apt-xapian-index

I have clicked Install updates on the Update Manager, a crash has been detected in aptd (bug #793400), and another error message popped up to report this problem, about apt-xapian-index crashing.
---
Ubuntu Bug Squad volunteer triager
http://wiki.ubuntu.com/BugSquad

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: apt-xapian-index 0.41ubuntu6
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic-pae 2.6.38.2
Uname: Linux 2.6.38-8-generic-pae i686
Architecture: i386
Date: Tue Jun 7 10:36:39 2011
ExecutablePath: /usr/sbin/update-apt-xapian-index
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/sbin/update-apt-xapian-index -q
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/sh
PythonArgs: ['/usr/sbin/update-apt-xapian-index', '-q']
SourcePackage: apt-xapian-index
Title: update-apt-xapian-index crashed with AttributeError in index(): class CustomKeys has no attribute 'CATEGORY'
UpgradeStatus: Upgraded to natty on 2011-04-27 (40 days ago)
UserGroups:

[Launchpad Janitor (janitor)]

This bug was fixed in the package software-center - 4.1.5

---------------
software-center (4.1.5) oneiric; urgency=low

  [ Gary Lasker ]
  * data/ui/SoftwareCenter.ui,
    softwarecenter/app.py,
    softwarecenter/enums.py,
    softwarecenter/ui/gtk/appview.py:
    - implement history navigation using the mouse back/forward
      buttons (LP: #782661)
  * softwarecenter/app.py,
    softwarecenter/backend/channel.py,
    softwarecenter/ui/gtk/appdetailsview_gtk.py,
    softwarecenter/ui/gtk/catview_gtk.py,
    softwarecenter/ui/gtk/channelpane.py,
    softwarecenter/ui/gtk/softwarepane.py:
    - refactor/simplify the view background overlay code and
      fix issue where the background image is sometimes not
      rendered for installed channels (LP: #724724)
   * setup.py:
    - update script name to x2go_helper.py for happier build

  [ Michael Vogt ]
  * merged lp:~alexeftimie/software-center/debian-small-fixes, many
    thanks!
  * merged lp:~alexeftimie/software-center/backend-refactor to
    cleanup more code
  * merged lp:~weblive-dev/software-center/weblive-x2go, many thanks
    to Stephane Graber!
  * merged lp:~aaronp/software-center/lp790450-for-4.0, many thanks
    to Aaron Peachey
  * add support for X-AppInstall-Icon-Url (and also icon_url from
    SoftwareCenterAgent)
  * merged lp:~mterry/software-center/network-manager-0.9, many
    thanks to Michael Terry
  * merged lp:~mmcg069/software-center/enum-style-idea, this cleans
    up the the enum code handling, many thanks!
  * integration work on the qml branch
  * merged lp:~evfool/software-center/fix793896, many thanks to
    Robert Roth, LP: #793896

  [ Olivier Tilloy ]
  * add QML ui frontend (lp:~osomon/software-center/qml)
 -- Michael Vogt <email address hidden> Tue, 07 Jun 2011 15:36:46 +0200