wnck-applet crashed with SIGSEGV in bonobo_ui_component_add_verb_list()

[Bratmaxe]

Binary package hint: gnome-panel

I have updated my system and after a restart i become this error message

ProblemType: Crash
DistroRelease: Ubuntu 10.04
Package: gnome-panel 1:2.30.0-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.32-21.32-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-21-generic i686
Architecture: i386
Date: Thu Apr 22 14:48:23 2010
ExecutablePath: /usr/lib/gnome-panel/wnck-applet
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Alpha i386 (20100325)
ProcCmdline: /usr/lib/gnome-panel/wnck-applet --oaf-activate-iid=OAFIID:GNOME_Wncklet_Factory --oaf-ior-fd=18
ProcEnviron:
 LANG=de_DE.utf8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x804c706: mov (%ebx),%eax
 PC (0x0804c706) ok
 source "(%ebx)" (0x00000000) not located in a known VMA region (needed readable region)!
 destination "%eax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: gnome-panel
StacktraceTop:
 ?? ()
 ?? ()
 bonobo_ui_component_add_verb_list ()
 g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
 bonobo_closure_invoke_va_list ()
Title: wnck-applet crashed with SIGSEGV in bonobo_ui_component_add_verb_list()
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
XsessionErrors: (polkit-gnome-authentication-agent-1:1286): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed

[Apport retracing service (apport)]

StacktraceTop:
 wncklet_connect_while_alive (object=0x0,
 display_properties_dialog (uic=0x93c0e00, pager=0x94894a0,
 bonobo_ui_component_add_verb_list (component=0x948c690,
 IA__g_closure_invoke (closure=0x804f160,
 bonobo_closure_invoke_va_list (closure=0x948c690,