unity-2d-shell crashed with SIGSEGV in QDBusAbstractInterface::asyncCallWithArgumentList()

I was working in gnome-terminal and I pressed the alt key.
A different thing in my environement is that I use orca.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: unity-2d-shell 5.10.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.0.1-0ubuntu2
Architecture: amd64
Date: Sat Apr 14 03:39:19 2012
ExecutablePath: /usr/bin/unity-2d-shell
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328)
ProcCmdline: unity-2d-shell
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7f6dbcfd74dd <_ZN22QDBusAbstractInterface25asyncCallWithArgumentListERK7QStringRK5QListI8QVariantE+45>: cmpb $0x0,0xd4(%rbp)
 PC (0x7f6dbcfd74dd) ok
 source "$0x0" ok
 destination "0xd4(%rbp)" (0x00025b99) not located in a known VMA region (needed writable region)!
SegvReason: writing unknown VMA
Signal: 11
SourcePackage: unity-2d
StacktraceTop:
 QDBusAbstractInterface::asyncCallWithArgumentList(QString const&, QList<QVariant> const&) () from /usr/lib/x86_64-linux-gnu/libQtDBus.so.4
 BamfView::icon() const () from /usr/lib/libQtBamf.so.1
 WindowInfo::icon() const () from /usr/lib/libunity-2d-private.so.0
 WindowInfo::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libunity-2d-private.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libQtDeclarative.so.4
Title: unity-2d-shell crashed with SIGSEGV in QDBusAbstractInterface::asyncCallWithArgumentList()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: libvirtd