bzr bombs during push to svn

andreas@andi-lap:~/lookery/lookery> bzr push 'https://lookery_andreas:<email address hidden>/svn/lookery_process/trunk/logs/lookery-base'

bzr: ERROR: exceptions.IndexError: tuple index out of range

Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/bzrlib/commands.py", line 806, in run_bzr_catch_errors
    return run_bzr(argv)
  File "/usr/lib/python2.4/site-packages/bzrlib/commands.py", line 762, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.4/site-packages/bzrlib/commands.py", line 492, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.4/site-packages/bzrlib/builtins.py", line 803, in run
    revision_id=last_revision_id)
  File "/usr/lib/python2.4/site-packages/bzrlib/repository.py", line 916, in fetch
    return inter.fetch(revision_id=revision_id, pb=pb, find_ghosts=find_ghosts)
  File "/usr/lib/python2.4/site-packages/bzrlib/plugins/svn/commit.py", line 778, in fetch
    self.copy_content(revision_id=revision_id, pb=pb)
  File "/usr/lib/python2.4/site-packages/bzrlib/plugins/svn/commit.py", line 740, in copy_content
    revision_id = self.source.revision_parents(revision_id)[0]
IndexError: tuple index out of range

bzr 1.1.0.candidate.1 on python 2.4.4.final.0 (linux2)
arguments: ['/usr/bin/bzr', 'push', 'https://lookery_andreas:<email address hidden>/svn/lookery_process/trunk/logs/lookery-base']
encoding: 'UTF-8', fsenc: 'UTF-8', lang: 'de_DE.UTF-8@euro'
plugins:
  bzrtools /usr/lib/python2.4/site-packages/bzrlib/plugins/bzrtools [1.1.0]
  launchpad /usr/lib/python2.4/site-packages/bzrlib/plugins/launchpad [unknown]
  multiparent /usr/lib/python2.4/site-packages/bzrlib/plugins/multiparent.pyc [unknown]
  svn /usr/lib/python2.4/site-packages/bzrlib/plugins/svn [0.4.7]
*** 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.