update-apt-xapian-index crashed with ValueError in index(): invalid null reference in method 'Document_add_value', argument 3 of type 'std::string const &'

[Xavier Fung]

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ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: apt-xapian-index 0.44ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-7.8-generic 3.0.0
Uname: Linux 3.0.0-7-generic x86_64
Architecture: amd64
Date: Sun Jul 31 07:52:29 2011
ExecutablePath: /usr/sbin/update-apt-xapian-index
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/sbin/update-apt-xapian-index -q
ProcCwd: /var/backups
ProcEnviron:
 LANGUAGE=en_HK:en
 PATH=(custom, no user)
 LANG=en_HK.UTF-8
 SHELL=/bin/sh
PythonArgs: ['/usr/sbin/update-apt-xapian-index', '-q']
SourcePackage: apt-xapian-index
Title: update-apt-xapian-index crashed with ValueError in index(): invalid null reference in method 'Document_add_value', argument 3 of type 'std::string const &'
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: