nepomukserver crashed with SIGSEGV in close()

This just happens from time to time.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: kde-runtime 4:4.8.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-17.27-generic 3.2.6
Uname: Linux 3.2.0-17-generic x86_64
ApportVersion: 1.94-0ubuntu1
Architecture: amd64
Date: Sat Mar 3 10:54:49 2012
ExecutablePath: /usr/bin/nepomukserver
InstallationMedia: Kubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427)
ProcCmdline: /usr/bin/nepomukserver
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7f55197bfbd3 <_ZN9QHashData14detach_helper2EPFvPNS_4NodeEPvEPFvS1_Eii+227>: mov (%rax,%rdx,8),%rbx
 PC (0x7f55197bfbd3) ok
 source "(%rax,%rdx,8)" (0x00000040) not located in a known VMA region (needed readable region)!
 destination "%rbx" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: kde-runtime
StacktraceTop:
 close () from /lib/x86_64-linux-gnu/libc.so.6
 ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
 ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
 ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
 ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
Title: nepomukserver crashed with SIGSEGV in close()
UpgradeStatus: Upgraded to precise on 2012-02-14 (17 days ago)
UserGroups: adm admin audio cdrom dialout floppy libvirtd lpadmin plugdev users video