exceptions.KeyError on log

[Matthias Müller-Reineke]

From my shell:

mueller@gutsy:~/reproduce_error$ bzr branch lp:bzr
You have not informed bzr of your launchpad login. If you are attempting a write operation it may fail. If it does, run "bzr launchpad-login YOUR_ID" to set your login and try again.

Branched 3373 revision(s).
mueller@gutsy:~/reproduce_error$ cd bzr/
mueller@gutsy:~/reproduce_error/bzr$ bzr log bzrlib/dirstate.py
bzr: ERROR: exceptions.KeyError: '<email address hidden>'

Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 846, in run_bzr_catch_errors
    return run_bzr(argv)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 802, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 504, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 812, in ignore_pipe
    result = func(*args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/builtins.py", line 1791, in run
    limit=limit)
  File "/usr/lib/python2.5/site-packages/bzrlib/log.py", line 185, in show_log
    start_revision, end_revision, search, limit)
  File "/usr/lib/python2.5/site-packages/bzrlib/log.py", line 215, in _show_log
    allow_single_merge_revision)
  File "/usr/lib/python2.5/site-packages/bzrlib/log.py", line 282, in calculate_view_revisions
    view_revisions)
  File "/usr/lib/python2.5/site-packages/bzrlib/log.py", line 482, in _filter_revisions_touching_file_id
    rev_ancestry = rev_ancestry.union(ancestry[parent])
KeyError: '<email address hidden>'

bzr 1.4rc1 on python 2.5.1 (linux2)
arguments: ['/usr/bin/bzr', 'log', 'bzrlib/dirstate.py']
encoding: 'UTF-8', fsenc: 'UTF-8', lang: 'de_DE.UTF-8'
plugins:
  launchpad /usr/lib/python2.5/site-packages/bzrlib/plugins/launchpad [unknown]
*** Bazaar has encountered an internal error.
    Please report a bug at https://bugs.launchpad.net/bzr/+filebug
    including this traceback, and a description of what you
    were doing when the error occurred.
mueller@gutsy:~/reproduce_error/bzr$