nepomukservicestub crashed with SIGSEGV in pthread_cond_wait@@GLIBC_2.3.2()

[dysmann]

I didn't see anything appart from the message informing about the crash.
I don't use nepomuk.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: kde-runtime 4:4.8.2-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu1
Architecture: amd64
Date: Thu Apr 12 01:48:27 2012
Disassembly: => 0x0: Cannot access memory at address 0x0
ExecutablePath: /usr/bin/nepomukservicestub
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
ProcCmdline: /usr/bin/nepomukservicestub nepomukfilewatch
ProcEnviron:
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x0: Cannot access memory at address 0x0
 PC (0x00000000) not located in a known VMA region (needed executable region)!
SegvReason: executing NULL VMA
Signal: 11
SourcePackage: kde-runtime
StacktraceTop:
 ?? ()
 QObject::~QObject() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
 QObject::~QObject() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
 _start ()
Title: nepomukservicestub crashed with SIGSEGV in QObject::~QObject()
UpgradeStatus: Upgraded to precise on 2012-04-08 (3 days ago)
UserGroups: adm admin cdrom dialout dip fax floppy fuse lpadmin plugdev sambashare tape video www-data

[Apport retracing service (apport)]

StacktraceTop:
 pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
 wait (time=18446744073709551615, this=0x24e3e40) at thread/qwaitcondition_unix.cpp:86
 QWaitCondition::wait (this=<optimized out>, mutex=0x24e4b28, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:158
 QThread::wait (this=<optimized out>, time=18446744073709551615) at thread/qthread_unix.cpp:651
 Nepomuk::InvalidFileResourceCleaner::~InvalidFileResourceCleaner (this=0x24e47c0, __in_chrg=<optimized out>) at ../../../../nepomuk/services/filewatch/invalidfileresourcecleaner.cpp:53