software-center crashed with AttributeError in __expose_cb()

Binary package hint: software-center

crash screen appears after opening software-center and each mouse action like opening a group of programs or program's description.

This error occurs when using the Human-Clearlooks theme. Steps to reproduce:

1. Open System->Preferences->Appearance
2. In the "Theme" tab of the Appearance dialog, choose "Human-Clearlooks"
3. Click "Close" to exit the Appearance dialog
4. Note that the navigation bar does not appear
5. Click any category, such as "Accessories"
6. The crash dialog will be displayed

ProblemType: Crash
Architecture: i386
Date: Thu Feb 18 00:21:26 2010
DistroRelease: Ubuntu 10.04
ExecutablePath: /usr/share/software-center/software-center
InterpreterPath: /usr/bin/python2.6
Package: software-center 1.1.12
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/software-center
ProcEnviron:
 LANGUAGE=ru_RU.UTF-8
 LANG=ru_RU.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-13.18-generic
PythonArgs: ['/usr/bin/software-center']
SourcePackage: software-center
Title: software-center crashed with AttributeError in __expose_cb()
Traceback:
 Traceback (most recent call last):
   File "/usr/share/software-center/softwarecenter/view/widgets/pathbar2.py", line 808, in __expose_cb
     if self.theme.base_hack:
 AttributeError: PathBarThemeHumanClearlooks instance has no attribute 'base_hack'
Uname: Linux 2.6.32-13-generic i686
UserGroups: adm admin audio cdrom dialout dip fax floppy fuse lpadmin netdev plugdev sambashare tape video