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

[Anders Etzerodt Salling Pedersen]

Ubuntu 11.10 amd64
software-center 4.1.21

I was trying to install latest stable 64-bit .deb of Google Chrome from the official Chrome download site, but software-center crashed only a few seconds after I double-clicked the file. I installed Ubuntu Tweak a moment before without a glitch.

Bear with me as this is my first real bug report and info might be missing :-)

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: software-center 4.1.21
ProcVersionSignature: Ubuntu 3.0.0-10.16-generic 3.0.4
Uname: Linux 3.0.0-10-generic x86_64
Architecture: amd64
Date: Wed Sep 7 17:23:05 2011
ExecutablePath: /usr/share/software-center/software-center-gtk3
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110901)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/software-center-gtk3 /home/username/Hentninger/google-chrome-stable_current_amd64.deb
ProcEnviron:
 PATH=(custom, no user)
 LANG=da_DK.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/software-center-gtk3', '/home/username/Hentninger/google-chrome-stable_current_amd64.deb']
SourcePackage: software-center
Title: software-center-gtk3 crashed with AttributeError in preparse(): 'NoneType' object has no attribute 'lower'
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 #839113, 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.