gnome-panel crashed with SIGSEGV in gtk_style_context_get_valist()

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ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: gnome-panel 1:3.3.5-0ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-16.25-generic 3.2.6
Uname: Linux 3.2.0-16-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.91-0ubuntu1
Architecture: amd64
CrashCounter: 1
Date: Sat Feb 18 06:03:22 2012
EcryptfsInUse: Yes
ExecutablePath: /usr/bin/gnome-panel
ProcCmdline: gnome-panel
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, user)
 LANG=de_DE.UTF-8
 LANGUAGE=de:en
SegvAnalysis:
 Segfault happened at: 0x7f312699ad27 <gtk_style_context_get_valist+215>: mov 0x30(%rax),%rdx
 PC (0x7f312699ad27) ok
 source "0x30(%rax)" (0x00000030) not located in a known VMA region (needed readable region)!
 destination "%rdx" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: gnome-panel
StacktraceTop:
 gtk_style_context_get_valist () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
 gtk_style_context_get () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
 gtk_style_context_get_background_color () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
 ?? ()
 ?? ()
Title: gnome-panel crashed with SIGSEGV in gtk_style_context_get_valist()
UpgradeStatus: Upgraded to precise on 2012-02-12 (5 days ago)
UserGroups: admin fuse