zeitgeist-daemon crashed with SIGSEGV in ChertTable::form_key()

I applied a bunch of updates on 2011-07-07 (I can post a full list if it's relevant), though zeitgeist-daemon is not among them and none of the packages updated seems relevant at first glance. I powered off the system and, upon first booting today, the message about the crash popped up.

I'll report on whether it happens every time once I've had a chance to reboot again.

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: zeitgeist-core 0.7.1-1
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: wl
Architecture: amd64
Date: Fri Jul 8 09:18:23 2011
ExecutablePath: /usr/bin/zeitgeist-daemon
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/zeitgeist-daemon
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, user)
 LANGUAGE=en_CA:en
 LANG=en_CA.UTF-8
SegvAnalysis:
 Segfault happened at: 0x7f28392bc759 <_ZNK10ChertTable8form_keyERKSs+265>: mov %dl,0x2(%rax)
 PC (0x7f28392bc759) ok
 source "%dl" ok
 destination "0x2(%rax)" (0x18617b00002) not located in a known VMA region (needed writable region)!
 Stack memory exhausted (SP below stack segment)
SegvReason: writing unknown VMA
Signal: 11
SourcePackage: zeitgeist
StacktraceTop:
 ChertTable::form_key(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) const () from /usr/lib/libxapian.so.22
 ChertTable::get_exact_entry(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&) const () from /usr/lib/libxapian.so.22
 ?? () from /usr/lib/libxapian.so.22
 ?? () from /usr/lib/libxapian.so.22
 ?? () from /usr/lib/libxapian.so.22
Title: zeitgeist-daemon crashed with SIGSEGV in ChertTable::form_key()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare