computer-janitor-gtk crashed with NameError in close()

Binary package hint: computer-janitor

After an dpkg error, computer janitor showed a warning message. The "Ok" Button of the Warning message didn't work and raised above error. Closing the dialog using the window close symbol worked.

ProblemType: Crash
Architecture: i386
DistroRelease: /usr/bin/lsb_release:81: DeprecationWarning: the sets module is deprecated import sets Ubuntu 9.04
ExecutablePath: /usr/bin/computer-janitor-gtk
InterpreterPath: /usr/bin/python2.6
NonfreeKernelModules: nvidia
Package: computer-janitor-gtk 1.12-0ubuntu1
PackageArchitecture: all
ProcAttrCurrent: unconfined
ProcCmdline: /usr/bin/python /usr/bin/computer-janitor-gtk
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, no user)
 LANG=zh_TW.UTF-8
 LANGUAGE=zh_TW:zh:en_US:en
PythonArgs: ['/usr/bin/computer-janitor-gtk']
SourcePackage: computer-janitor
Title: computer-janitor-gtk crashed with NameError in close()
Traceback:
 Traceback (most recent call last):
   File "/usr/lib/python2.6/dist-packages/computerjanitorapp/ui_gtk.py", line 258, in close
     dialog.destroy()
 NameError: free variable 'dialog' referenced before assignment in enclosing scope
Uname: Linux 2.6.28-8-generic i686
UserGroups: