nepomukservicestub crashed with SIGSEGV

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ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: kde-runtime 4:4.8.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-20.32-generic 3.2.12
Uname: Linux 3.2.0-20-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.95-0ubuntu1
Architecture: amd64
Date: Sat Mar 24 14:46:44 2012
Disassembly: => 0x0: Cannot access memory at address 0x0
ExecutablePath: /usr/bin/nepomukservicestub
InstallationMedia: Kubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120224)
ProcCmdline: /usr/bin/nepomukservicestub nepomukstorage
ProcEnviron:
 LANGUAGE=it_IT
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
SegvReason: executing NULL VMA
Signal: 11
SourcePackage: kde-runtime
StacktraceTop: ?? ()
Title: nepomukservicestub crashed with SIGSEGV
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

Stacktrace:
 #0 0x0000000000000000 in ?? ()
 No symbol table info available.
 Cannot access memory at address 0x7fdb3b08fb28
StacktraceTop: ?? ()