gannotate: IndexError: list index out of range

Crashing when trying to run `bzr gannotate` on Ubuntu quantal using bzt-gtk trunk.

** (bzr:3988): CRITICAL **: Stack overflow protection. Can't copy array element into GIArgument.
bzr: ERROR: exceptions.IndexError: list index out of range

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 930, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 1141, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 673, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 697, in run
    return self._operation.run_simple(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 136, in run_simple
    self.cleanups, self.func, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 166, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "/home/andrew/.bazaar/plugins/gtk/commands.py", line 267, in run
    window = GAnnotateWindow(all, plain, branch=br)
  File "/home/andrew/.bazaar/plugins/gtk/annotate/gannotate.py", line 59, in __init__
    self._create()
  File "/home/andrew/.bazaar/plugins/gtk/annotate/gannotate.py", line 196, in _create
    self.annoview = self._create_annotate_view()
  File "/home/andrew/.bazaar/plugins/gtk/annotate/gannotate.py", line 283, in _create_annotate_view
    tv.get_style().bg[Gtk.StateType.NORMAL])
IndexError: list index out of range

bzr 2.6b2 on python 2.7.3 (Linux-3.5.0-13-generic-i686-athlon-with-
    Ubuntu-12.10-quantal)
arguments: ['/usr/bin/bzr', 'gannotate', 'google-webfont-
    downloader.desktop.in']
plugins: bash_completion[2.6b2], bookmarks[2.3.0dev], builddeb[2.7.0dev],
    builder[0.7.3], bzrtools[2.5.0], changelog_merge[2.6b2], dbus[0.1.0dev],
    diffstat[0.2.0], etckeeper[unknown], explorer[1.3.0], fastimport[0.13.0],
    git[0.6.9], grep[0.5.0dev], gtk[0.104.0dev], launchpad[2.6b2],
    loom[2.2.0], netrc_credential_store[2.6b2], news_merge[2.6b2],
    po_merge[2.6b2], qbzr[0.22.2], rewrite[0.6.4dev], search[1.7.0dev],
    stats[0.2.0dev], svn[1.2.1], weave_fmt[2.6b2]
encoding: 'utf-8', fsenc: 'UTF-8', lang: 'en_US.UTF-8'

*** Bazaar has encountered an internal error. This probably indicates a
    bug in Bazaar. You can help us fix it by filing a bug report at
        https://bugs.launchpad.net/bzr/+filebug
    including this traceback and a description of the problem.