kactivitymanagerd crashed with SIGSEGV in Private()

[gorgonizer]

kactivitymanagerd crashed whilst running in the background (as I do not currently use the activities feature).

ProblemType: Crash
DistroRelease: Ubuntu 13.04
Package: libkactivities-bin 4:4.10.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.8.0-13.22-generic 3.8.3
Uname: Linux 3.8.0-13-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.9.1-0ubuntu1
Architecture: amd64
Date: Sat Mar 16 04:05:59 2013
ExecutablePath: /usr/bin/kactivitymanagerd
InstallationDate: Installed on 2012-02-08 (401 days ago)
InstallationMedia: Kubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120208)
MarkForUpload: True
ProcCmdline: /usr/bin/kactivitymanagerd --nocrashhandler
ProcEnviron:
 LANGUAGE=en_GB
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7f6b1833b846 <QVariant::QVariant(QVariant const&)+22>: mov (%rsi),%rcx
 PC (0x7f6b1833b846) ok
 source "(%rsi)" (0x00000000) not located in a known VMA region (needed readable region)!
 destination "%rcx" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: kactivities
StacktraceTop:
 Private (other=..., this=0x7fffb5864cc0) at ../../include/QtCore/../../src/corelib/kernel/qvariant.h:356
 QVariant::QVariant (this=0x7fffb5864cc0, p=...) at kernel/qvariant.cpp:1423
 QDBusPendingReplyData::argumentAt (this=0x7fffb5864be0, index=0) at qdbuspendingreply.cpp:270
 argumentAt<0> (this=0x7fffb5864be0) at /usr/include/qt4/QtDBus/qdbuspendingreply.h:176
 operator QDBusPendingReplyTypes::Select<0, QList<int>, void, void, void, void, void, void, void>::Type (this=0x7fffb5864be0) at /usr/include/qt4/QtDBus/qdbuspendingreply.h:186
Title: kactivitymanagerd crashed with SIGSEGV in Private()
UpgradeStatus: Upgraded to raring on 2013-02-16 (28 days ago)
UserGroups: adm cdrom dip fuse kvm libvirtd lpadmin plugdev sambashare sudo users

[Apport retracing service (apport)]

StacktraceTop:
 Private (other=..., this=0x7fffb5864cc0) at ../../include/QtCore/../../src/corelib/kernel/qvariant.h:356
 QVariant::QVariant (this=0x7fffb5864cc0, p=...) at kernel/qvariant.cpp:1423
 QDBusPendingReplyData::argumentAt (this=0x7fffb5864be0, index=0) at qdbuspendingreply.cpp:270
 argumentAt<0> (this=0x7fffb5864be0) at /usr/include/qt4/QtDBus/qdbuspendingreply.h:176
 operator QDBusPendingReplyTypes::Select<0, QList<int>, void, void, void, void, void, void, void>::Type (this=0x7fffb5864be0) at /usr/include/qt4/QtDBus/qdbuspendingreply.h:186