compiz crashed with SIGSEGV in gdk_pixbuf_get_width()

Pressed Alt on a Citrix Xen maximized window, some sort of search box appeared at the top and compiz crashed.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: unity 5.4.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-17.27-generic 3.2.6
Uname: Linux 3.2.0-17-generic x86_64
ApportVersion: 1.94-0ubuntu2
Architecture: amd64
CheckboxSubmission: ed5dbdfb54bf5043a043813a33527c9f
CheckboxSystem: b633b4f40868d491c2ae5b50030ce6f3
Date: Tue Mar 6 08:28:57 2012
ExecutablePath: /usr/bin/compiz
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
ProcCmdline: compiz
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7fcf68b4636e <gdk_pixbuf_get_width+14>: mov (%rbx),%rdx
 PC (0x7fcf68b4636e) ok
 source "(%rbx)" (0xa7730a7730a7730) not located in a known VMA region (needed readable region)!
 destination "%rdx" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: unity
StacktraceTop:
 gdk_pixbuf_get_width () from /usr/lib/x86_64-linux-gnu/libgdk_pixbuf-2.0.so.0
 unity::hud::HudIconTextureSource::ColorForIcon(_GdkPixbuf*) () from /usr/lib/compiz/libunityshell.so
 ?? () from /usr/lib/compiz/libunityshell.so
 unity::IconTexture::IconLoaded(std::string const&, unsigned int, _GdkPixbuf*) () from /usr/lib/compiz/libunityshell.so
 unity::IconLoader::Impl::CoalesceTasksCb(unity::IconLoader::Impl*) () from /usr/lib/compiz/libunityshell.so
Title: compiz crashed with SIGSEGV in gdk_pixbuf_get_width()
UpgradeStatus: Upgraded to precise on 2011-12-17 (79 days ago)
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