software-center crashed with TypeError in _get_combo_children(): object of type 'NoneType' has no len()

[George Christofis]

I opened the Sofware Center and it doesn't loading. I closed it and i opened the Dash to search a programm from the search box of Dash. While i was typing on Dash hit this bug and the Dash closed itself.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: software-center 5.1.7
ProcVersionSignature: Ubuntu 3.2.0-12.21-generic 3.2.2
Uname: Linux 3.2.0-12-generic i686
ApportVersion: 1.91-0ubuntu1
Architecture: i386
Date: Thu Feb 2 15:09:17 2012
ExecutablePath: /usr/share/software-center/software-center
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha i386 (20111129.1)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/software-center
ProcEnviron:
 PATH=(custom, no user)
 LANG=el_GR.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/software-center']
SourcePackage: software-center
Title: software-center crashed with TypeError in _get_combo_children(): object of type 'NoneType' has no len()
UpgradeStatus: Upgraded to precise on 2012-02-02 (0 days ago)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Gary Lasker (gary-lasker)]

Hello George, and thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 885726, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.

Thanks again for your help!