nepomukserver crashed with SIGABRT in pthread_cond_wait@@GLIBC_2.3.2()

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when i reboot pc

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: kde-runtime 4:4.8.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-19.30-generic-pae 3.2.11
Uname: Linux 3.2.0-19-generic-pae i686
ApportVersion: 1.94.1-0ubuntu2
Architecture: i386
Date: Sun Mar 18 19:38:28 2012
ExecutablePath: /usr/bin/nepomukserver
InstallationMedia: Kubuntu 12.04 LTS "Precise Pangolin" - Alpha i386 (20120317)
ProcCmdline: /usr/bin/nepomukserver
ProcEnviron:
 LANGUAGE=en_US
 LANG=en_US.UTF-8
 SHELL=/bin/bash
Signal: 6
SourcePackage: kde-runtime
StacktraceTop:
 pthread_cond_wait@@GLIBC_2.3.2 () from /lib/i386-linux-gnu/libpthread.so.0
 pthread_cond_wait () from /lib/i386-linux-gnu/libc.so.6
 wait (time=4294967295, this=0x95781f8) at thread/qwaitcondition_unix.cpp:86
 QWaitCondition::wait (this=0x95780e0, mutex=0x95780c4, time=4294967295) at thread/qwaitcondition_unix.cpp:158
 QThread::wait (this=0xb6e71e38, time=4294967295) at thread/qthread_unix.cpp:651
Title: nepomukserver crashed with SIGABRT in pthread_cond_wait@@GLIBC_2.3.2()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

StacktraceTop:
 pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/pthread_cond_wait.S:169
 __pthread_cond_wait (cond=0x9578210, mutex=0x95781f8) at forward.c:139
 wait (time=4294967295, this=0x95781f8) at thread/qwaitcondition_unix.cpp:86
 QWaitCondition::wait (this=0x95780e0, mutex=0x95780c4, time=4294967295) at thread/qwaitcondition_unix.cpp:158
 QThread::wait (this=0xb6e71e38, time=4294967295) at thread/qthread_unix.cpp:651