nepomukservicestub crashed with SIGSEGV in close()

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When starting kubuntu

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: Wed Apr 11 22:15:50 2012
ExecutablePath: /usr/bin/nepomukservicestub
InstallationMedia: Kubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120411)
ProcCmdline: /usr/bin/nepomukservicestub nepomukfilewatch
ProcEnviron:
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x1d903aa: (bad)
 PC (0x01d903aa) in non-executable VMA region: 0x01bd6000-0x01e34000 rw-p [heap]
SegvReason: executing writable VMA [heap]
Signal: 11
SourcePackage: kde-runtime
Stacktrace:
 #0 0x0000000001d903aa in ?? ()
 No symbol table info available.
 #1 0x000000000040406a in _start ()
 No symbol table info available.
StacktraceTop:
 ?? ()
 _start ()
Title: nepomukservicestub crashed with SIGSEGV in _start()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

StacktraceTop:
 close () at ../sysdeps/unix/syscall-template.S:82
 KDirWatchPrivate::~KDirWatchPrivate (this=0x1d2aec0, __in_chrg=<optimized out>) at ../../kdecore/io/kdirwatch.cpp:264
 KDirWatchPrivate::~KDirWatchPrivate (this=0x1d2aec0, __in_chrg=<optimized out>) at ../../kdecore/io/kdirwatch.cpp:269
 KDirWatch::~KDirWatch (this=0x1d29790, __in_chrg=<optimized out>) at ../../kdecore/io/kdirwatch.cpp:1771
 KDirWatch::~KDirWatch (this=0x1d29790, __in_chrg=<optimized out>) at ../../kdecore/io/kdirwatch.cpp:1774