compiz crashed with SIGSEGV in PluginClassHandler<DecorWindow, CompWindow, 0>::get()

Binary package hint: compiz

happend when I disabled the unity plugin in compiz-settings manager.

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: compiz-core 1:0.9.4-0ubuntu3
ProcVersionSignature: Ubuntu 2.6.38-5.32-generic 2.6.38-rc6
Uname: Linux 2.6.38-5-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
CrashCounter: 1
Date: Sat Mar 5 15:22:02 2011
ExecutablePath: /usr/bin/compiz
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110302)
ProcCmdline: compiz
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7feca1e3d3da <_ZN18PluginClassHandlerI11DecorWindow10CompWindowLi0EE3getEPS1_+266>: mov 0x30(%rbp),%rax
 PC (0x7feca1e3d3da) ok
 source "0x30(%rbp)" (0x00000030) not located in a known VMA region (needed readable region)!
 destination "%rax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: compiz
StacktraceTop:
 PluginClassHandler<DecorWindow, CompWindow, 0>::get(CompWindow*) () from /usr/lib/compiz/libdecor.so
 DecorScreen::handleEvent(_XEvent*) () from /usr/lib/compiz/libdecor.so
 CompScreen::handleEvent(_XEvent*) ()
 CompScreen::handleEvent(_XEvent*) ()
 RegexScreen::handleEvent(_XEvent*) () from /usr/lib/compiz/libregex.so
Title: compiz crashed with SIGSEGV in PluginClassHandler<DecorWindow, CompWindow, 0>::get()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare