compiz crashed with SIGSEGV in nux::WindowCompositor::MouseEventCycle()

Tried to close software-center (which has crashed before) through the menu in the launcher and then everything slows down, launcher stucks and then compiz crashed...

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: libnux-1.0-0 1.4.0-0ubuntu3
ProcVersionSignature: Ubuntu 3.0.0-9.14-generic 3.0.3
Uname: Linux 3.0.0-9-generic i686
Architecture: i386
Date: Fri Aug 26 13:24:02 2011
Disassembly: => 0x0: Cannot access memory at address 0x0
ExecutablePath: /usr/bin/compiz
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha i386 (20110803.1)
ProcCmdline: compiz
ProcEnviron:
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x0: Cannot access memory at address 0x0
 PC (0x00000000) not located in a known VMA region (needed executable region)!
SegvReason: executing NULL VMA
Signal: 11
SourcePackage: nux
StacktraceTop:
 ?? ()
 nux::WindowCompositor::MouseEventCycle(nux::Event&) () from /usr/lib/libnux-1.0.so.0
 nux::WindowCompositor::ProcessEvent(nux::Event&) () from /usr/lib/libnux-1.0.so.0
 nux::WindowThread::ExecutionLoop(unsigned int) () from /usr/lib/libnux-1.0.so.0
 nux::nux_event_dispatch(_GSource*, int (*)(void*), void*) () from /usr/lib/libnux-1.0.so.0
Title: compiz crashed with SIGSEGV in nux::WindowCompositor::MouseEventCycle()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare