emesene crashed with TypeError in _on_extension_changed(): 'NoneType' object does not support item assignment

[Namlee85]

Binary package hint: emesene

after the new version, design, i keep getting errors no matter what happen, this one i got when i clicked perferences and clicked on mute sounds

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: emesene 2.0~git20110303-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-6.34-generic 2.6.38-rc7
Uname: Linux 2.6.38-6-generic i686
Architecture: i386
Date: Thu Mar 10 23:01:19 2011
ExecutablePath: /usr/share/emesene/emesene/emesene
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: python /usr/bin/emesene
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/emesene']
SourcePackage: emesene
Title: emesene crashed with TypeError in _on_extension_changed(): 'NoneType' object does not support item assignment
Traceback:
 Traceback (most recent call last):
   File "/usr/share/emesene/emesene/gui/gtkui/Preferences.py", line 687, in _on_extension_changed
     self.session.config.d_extensions[category] = identifier
 TypeError: 'NoneType' object does not support item assignment
UpgradeStatus: Upgraded to natty on 2011-03-10 (0 days ago)
UserGroups: adm admin cdrom dialout lpadmin mythtv 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 #729124, 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.