bzr crashed with TypeError in update_search(): QAbstractItemView.setCurrentIndex(QModelIndex): argument 1 has unexpected type 'NoneType'

Binary package hint: bzr

I was using bzr qlog to search for a revision number in the history of a branch.
As soon as i typed the last digits of the revision, it crashed. I can reproduce the crash consistentently.

This is some additional data that was reported in a separate window from the apport window:

bzr: ERROR: exceptions.TypeError: QAbstractItemView.setCurrentIndex(QModelIndex): argument 1 has unexpected type 'NoneType'

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/qbzr/lib/uifactory.py", line 32, in decorate
    r = f(*args, **kargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/qbzr/lib/log.py", line 471, in update_search
    self.log_list.setCurrentIndex(index)
TypeError: QAbstractItemView.setCurrentIndex(QModelIndex): argument 1 has unexpected type 'NoneType'

bzr 2.3.1 on python 2.7.1 (linux2)
arguments: ['/usr/bin/bzr', 'qlog']
encoding: 'UTF-8', fsenc: 'UTF-8', lang: 'en_US.UTF-8'
plugins:
  bash_completion /usr/lib/python2.7/dist-packages/bzrlib/plugins/bash_completion [2.3.1]
  builddeb /usr/lib/python2.7/dist-packages/bzrlib/plugins/builddeb [2.7.0dev]
  bzrtools /usr/lib/python2.7/dist-packages/bzrlib/plugins/bzrtools [2.3.1]
  launchpad /usr/lib/python2.7/dist-packages/bzrlib/plugins/launchpad [2.3.1]
  netrc_credential_store /usr/lib/python2.7/dist-packages/bzrlib/plugins/netrc_credential_store [2.3.1]
  news_merge /usr/lib/python2.7/dist-packages/bzrlib/plugins/news_merge [2.3.1]
  qbzr /usr/lib/python2.7/dist-packages/bzrlib/plugins/qbzr [0.20.0]
  rewrite /usr/lib/python2.7/dist-packages/bzrlib/plugins/rewrite [0.6.2dev]

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: bzr 2.3.1-1ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
Architecture: i386
BzrDebugFlags: set()
BzrVersion: 2.3.1
CommandLine: ['/usr/bin/bzr', 'qlog']
CrashDb: bzr
Date: Thu Apr 14 15:47:28 2011
ExecutablePath: /usr/bin/bzr
FileSystemEncoding: UTF-8
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta i386 (20110330)
InterpreterPath: /usr/bin/python2.7
Locale: en_US.UTF-8
PackageArchitecture: all
Platform: Linux-2.6.38-8-generic-i686-with-Ubuntu-11.04-natty
ProcCmdline: /usr/bin/python /usr/bin/bzr qlog
ProcEnviron:
 SHELL=/bin/bash
 LANG=en_US.UTF-8
 LANGUAGE=en_US:en
PythonVersion: 2.7.1
SourcePackage: bzr
Title: bzr crashed with TypeError in update_search(): QAbstractItemView.setCurrentIndex(QModelIndex): argument 1 has unexpected type 'NoneType'
UpgradeStatus: No upgrade log present (probably fresh install)
UserEncoding: UTF-8
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare