gtk-window-decorator crashed with SIGSEGV in g_object_unref()

I just logged on and got this error.

ProblemType: Crash
DistroRelease: Ubuntu 13.04
Package: compiz-gnome 1:0.9.9~daily13.01.21-0ubuntu1
ProcVersionSignature: Ubuntu 3.8.0-1.5-generic 3.8.0-rc4
Uname: Linux 3.8.0-1-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 313.18 Wed Jan 9 17:02:09 PST 2013
 GCC version: gcc version 4.7.2 (Ubuntu/Linaro 4.7.2-19ubuntu1)
.tmp.unity.support.test.0:

ApportVersion: 2.8-0ubuntu2
Architecture: amd64
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,staticswitcher,workarounds,scale,expo,ezoom,dbus]
CompositorRunning: compiz
CrashCounter: 1
Date: Mon Jan 21 10:31:11 2013
DistUpgraded: Fresh install
DistroCodename: raring
DistroVariant: ubuntu
DkmsStatus:
 nvidia, 310.19: added
 nvidia-313, 313.18, 3.8.0-1-generic, x86_64: installed
ExecutablePath: /usr/bin/gtk-window-decorator
GraphicsCard:
 NVIDIA Corporation G92 [GeForce 9800 GT] [10de:0605] (rev a2) (prog-if 00 [VGA controller])
   Subsystem: eVga.com. Corp. Device [3842:c973]
InstallationDate: Installed on 2012-12-28 (23 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20121228)
MachineType: MICRO-STAR INTERNATIONAL CO.,LTD MS-7529
MarkForUpload: True
ProcCmdline: /usr/bin/gtk-window-decorator
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz root=/dev/sda7 ro quiet splash
SegvAnalysis:
 Segfault happened at: 0x7f9b4ee21415: mov (%rax),%rdi
 PC (0x7f9b4ee21415) ok
 source "(%rax)" (0x00000000) not located in a known VMA region (needed readable region)!
 destination "%rdi" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: compiz
StacktraceTop:
 ?? () from /usr/lib/libwnck-1.so.22
 ?? () from /usr/lib/libwnck-1.so.22
 g_object_unref () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 ?? ()
 g_object_unref () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
Title: gtk-window-decorator crashed with SIGSEGV in g_object_unref()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
dmi.bios.date: 03/11/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: V2.8
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: G31M3-L V2(MS-7529)
dmi.board.vendor: MICRO-STAR INTERNATIONAL CO.,LTD
dmi.board.version: 1.0
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: MICRO-STAR INTERNATIONAL CO.,LTD
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV2.8:bd03/11/2010:svnMICRO-STARINTERNATIONALCO.,LTD:pnMS-7529:pvr1.0:rvnMICRO-STARINTERNATIONALCO.,LTD:rnG31M3-LV2(MS-7529):rvr1.0:cvnMICRO-STARINTERNATIONALCO.,LTD:ct3:cvr1.0:
dmi.product.name: MS-7529
dmi.product.version: 1.0
dmi.sys.vendor: MICRO-STAR INTERNATIONAL CO.,LTD
version.compiz: compiz 1:0.9.9~daily13.01.21-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.41-0ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.1~git20130104.r1.b8b1d61e-0ubuntu0ricotz
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.1~git20130104.r1.b8b1d61e-0ubuntu0ricotz
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.13.1.901+git20130104+server-1.13-branch.3a8c618a-0ubuntu0ricotz
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.0.99+git20130107.857d729e-0ubuntu0sarvatt
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.20.19-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.6+git20130107.8f934fad-0ubuntu0sarvatt
xserver.bootTime: Mon Jan 21 11:58:12 2013
xserver.configfile: default
xserver.devices:
 input Power Button KEYBOARD, id 6
 input Power Button KEYBOARD, id 7
 input UVC Camera (046d:081a) KEYBOARD, id 8
 input AT Translated Set 2 keyboard KEYBOARD, id 9
 input ImPS/2 Generic Wheel Mouse MOUSE, id 10
xserver.errors:
 open /dev/dri/card0: No such file or directory
 open /dev/dri/card0: No such file or directory
 open /dev/fb0: No such file or directory
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:

xserver.version: 2:1.13.1.901+git20130104+server-1.13-branch.3a8c618a-0ubuntu0ricotz