update-apt-xapian-index crashed with SystemError in open()

[Erik I]

Binary package hint: apt-xapian-index

Description: Ubuntu jaunty (development branch)
Release: 9.04

apt-xapian-index:
  Installert: 0.16
  Kandidat: 0.16
  Versjonstabell:
 *** 0.16 0
        500 http://no.archive.ubuntu.com jaunty/main Packages
        100 /var/lib/dpkg/status

Expected nothing special to happen.
Instead I got this bug.

ProblemType: Crash
Architecture: amd64
DistroRelease: Ubuntu 9.04
ExecutablePath: /usr/sbin/update-apt-xapian-index
InterpreterPath: /usr/bin/python2.6
Package: apt-xapian-index 0.16
PackageArchitecture: all
ProcAttrCurrent: unconfined
ProcCmdline: /usr/bin/python /usr/sbin/update-apt-xapian-index -q
ProcEnviron:
 PATH=(custom, no user)
 SHELL=/bin/sh
PythonArgs: ['/usr/sbin/update-apt-xapian-index', '-q']
SourcePackage: apt-xapian-index
Title: update-apt-xapian-index crashed with SystemError in open()
Uname: Linux 2.6.28-11-generic x86_64
UserGroups: