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

This crash happened to me while trying to open the software center, while the desktops were on expose mode.

There are some potential duplicates, but let's apport retracing service decide that.

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: libnux-0.9-0 0.9.42-0ubuntu1
ProcVersionSignature: User Name 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
Architecture: i386
Date: Tue Apr 12 20:23:40 2011
ExecutablePath: /usr/bin/compiz
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20110202)
ProcCmdline: compiz
ProcEnviron:
 LANGUAGE=es_ES:es:en_GB:en
 LANG=es_ES.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x176993b <_ZN3nux16WindowCompositor14RenderTopViewsEbRSt4listINS_13ObjectWeakPtrINS_10BaseWindowEEESaIS4_EEbb+91>: mov 0x10(%edx),%eax
 PC (0x0176993b) ok
 source "0x10(%edx)" (0x00000031) not located in a known VMA region (needed readable region)!
 destination "%eax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: nux
StacktraceTop:
 nux::WindowCompositor::RenderTopViews(bool, std::list<nux::ObjectWeakPtr<nux::BaseWindow>, std::allocator<nux::ObjectWeakPtr<nux::BaseWindow> > >&, bool, bool) () from /usr/lib/libnux-0.9.so.0
 nux::WindowCompositor::Draw(bool, bool) () from /usr/lib/libnux-0.9.so.0
 nux::WindowThread::RenderInterfaceFromForeignCmd(nux::Rect*) () from /usr/lib/libnux-0.9.so.0
 UnityScreen::paintDisplay(CompRegion const&) () from /usr/lib/compiz/libunityshell.so
 UnityScreen::glPaintOutput(GLScreenPaintAttrib const&, GLMatrix const&, CompRegion const&, CompOutput*, unsigned int) () from /usr/lib/compiz/libunityshell.so
Title: compiz crashed with SIGSEGV in nux::WindowCompositor::RenderTopViews()
UpgradeStatus: Upgraded to natty on 2011-04-12 (0 days ago)
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