nepomukservicestub crashed with SIGSEGV in librdf_world_open()

[maxfact]

i used live cd daily on 02/03/09
not doing anything particularly

ProblemType: Crash
Architecture: i386
DistroRelease: /usr/bin/lsb_release:81: DeprecationWarning: the sets module is deprecated import sets Ubuntu 9.04
ExecutablePath: /usr/bin/nepomukservicestub
Package: kdebase-runtime 4:4.2.0-0ubuntu1
ProcCmdline: /usr/bin/nepomukservicestub nepomukstorage
ProcEnviron:
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
 LANGUAGE=
Signal: 11
SourcePackage: kdebase-runtime
StacktraceTop:
 librdf_world_open () from /usr/lib/librdf.so.0
 librdf_new_hash_datum () from /usr/lib/librdf.so.0
 librdf_hash_get_one () from /usr/lib/librdf.so.0
 librdf_new_uri () from /usr/lib/librdf.so.0
 ?? () from /usr/lib/librdf.so.0
Title: nepomukservicestub crashed with SIGSEGV in librdf_world_open()
Uname: Linux 2.6.28-8-generic i686
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare