plasma-desktop crashed with AttributeError in __dtor__(): 'PythonWallpaperScript' object has no attribute 'pluginName'

[danae]

again the same thing. When I closed an active activity this wizzard came up

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: plasma-desktop 4:4.7.1-0ubuntu4
ProcVersionSignature: Ubuntu 3.0.0-12.19-generic 3.0.4
Uname: Linux 3.0.0-12-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu2
Architecture: i386
Date: Sat Oct 1 15:06:33 2011
ExecutablePath: /usr/bin/plasma-desktop
InstallationMedia: Kubuntu 11.10 "Oneiric Ocelot" - Beta i386 (20110921.2)
ProcCmdline: /usr/bin/plasma-desktop
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: kde-workspace
Title: plasma-desktop crashed with AttributeError in __dtor__(): 'PythonWallpaperScript' object has no attribute 'pluginName'
Traceback:
 Traceback (most recent call last):
   File "/usr/share/kde4/apps/plasma_scriptengine_python/pywallpaper.py", line 57, in __dtor__
     PythonWallpaperScript.importer.unregister_top_level(self.pluginName)
 AttributeError: 'PythonWallpaperScript' object has no attribute 'pluginName'
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[Harald Sitter (apachelogger)]

Inconclusive data, probably a plasmoid/wallpaper plugin causing the crash.