metacity crashed with SIGABRT in raise()

[Qusai Abu Hilal]

I switch between some programs like opera, chromium, then it appears.. but not always

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: metacity 1:2.34.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.0.0-8.11-generic 3.0.1
Uname: Linux 3.0.0-8-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Tue Aug 16 21:36:26 2011
ExecutablePath: /usr/bin/metacity
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110803.1)
ProcCmdline: metacity
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
Signal: 6
SourcePackage: metacity
StacktraceTop:
 raise () from /lib/x86_64-linux-gnu/libc.so.6
 abort () from /lib/x86_64-linux-gnu/libc.so.6
 ?? ()
 ?? ()
 _XError () from /usr/lib/x86_64-linux-gnu/libX11.so.6
Title: metacity crashed with SIGABRT in raise()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[Apport retracing service (apport)]

StacktraceTop:
 meta_bug (format=<optimized out>) at core/util.c:389
 x_error_handler (error=0x7fff4430fd20, xdisplay=0x156d980) at core/errors.c:247
 x_error_handler (xdisplay=0x156d980, error=0x7fff4430fd20) at core/errors.c:203
 _XError (dpy=0x156d980, rep=<optimized out>) at ../../src/XlibInt.c:1583
 handle_error (dpy=0x156d980, err=0x15ede80, in_XReply=<optimized out>) at ../../src/xcb_io.c:212

[dino99 (9d9)]

#833796: crashed with SIGABRT in _XError(), which seems different of that one, but reported as duplicate.