software-center crashed with DocNotFoundError in get_most_popular_applications_for_mimetype(): Document 873 not found

[Patryk "LeadMan" Benderz]

1)
patben@esp-patben-lin:/var/crash$ lsb_release -rd
Description: Ubuntu 11.04
Release: 11.04

2)
patben@esp-patben-lin:/var/crash$ apt-cache policy software-center
software-center:
  Zainstalowana: 4.0.5
  Kandydująca: 4.0.5
  Tabela wersji:
 *** 4.0.5 0
        500 http://pl.archive.ubuntu.com/ubuntu/ natty-proposed/main amd64 Packages
        100 /var/lib/dpkg/status
     4.0.4 0
        500 http://pl.archive.ubuntu.com/ubuntu/ natty-updates/main amd64 Packages
     4.0 0
        500 http://pl.archive.ubuntu.com/ubuntu/ natty/main amd64 Packages

3)
I expected to filter out all packages related to QT, thus I have entered "qt" string into a search field

4)
after entering search terms, packages have been filtered out, software-center seems still running, but I got crash report :\

Additional information:
I have searched for bug duplicates, but only found bug #728713 , which seems not exactly the same, but might be related to (difference: Document 147 not found). Anyway, for now I am removing 'need-duplicate-check' tag. You can decide mine is duplicate later.

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: software-center 4.0.5
ProcVersionSignature: Ubuntu 2.6.38-9.43-generic 2.6.38.4
Uname: Linux 2.6.38-9-generic x86_64
NonfreeKernelModules: fglrx
Architecture: amd64
Date: Mon Jul 25 10:18:56 2011
ExecutablePath: /usr/share/software-center/software-center
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/software-center
ProcEnviron:
 SHELL=/bin/bash
 LANG=pl_PL.UTF-8
 LANGUAGE=pl_PL:en
PythonArgs: ['/usr/bin/software-center']
SourcePackage: software-center
Title: software-center crashed with DocNotFoundError in get_most_popular_applications_for_mimetype(): Document 873 not found
UpgradeStatus: Upgraded to natty on 2011-05-27 (59 days ago)
UserGroups: adm admin audio cdrom dialout dip fax floppy fuse libvirtd lpadmin netdev plugdev sambashare tape video

[Kiwinote (kiwinote)]

Hi! Thanks for your bug report. We are tracking this issue over at bug 638706. Please continue to report any bugs you may find in software-center. Thanks again for your help!