software-center-gtk3 crashed with AttributeError in on_menu_file_activate(): 'NoneType' object has no attribute 'get_view_widget'

[macice]

ubuntu 11.10 Beta 30/08 64 bit running under Virtualbox 4..1.2 (Windows Host) crashed when launching Software Center from dock

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: software-center 4.1.20
ProcVersionSignature: Ubuntu 3.0.0-9.14-generic 3.0.3
Uname: Linux 3.0.0-9-generic x86_64
Architecture: amd64
Date: Tue Aug 30 17:29:56 2011
ExecutablePath: /usr/share/software-center/software-center-gtk3
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110830)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/software-center-gtk3
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, no username)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/software-center-gtk3']
SourcePackage: software-center
Title: software-center-gtk3 crashed with AttributeError in on_menu_file_activate(): 'NoneType' object has no attribute 'get_view_widget'
Traceback:
 Traceback (most recent call last):
   File "/usr/share/software-center/softwarecenter/ui/gtk3/app.py", line 572, in on_menu_file_activate
     self.active_pane = vm.get_view_widget(vm.get_active_view())
 AttributeError: 'NoneType' object has no attribute 'get_view_widget'
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #831679, so 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.