File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 1121, 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 "/usr/lib/python2.7/dist-packages/bzrlib/builtins.py", line 1243, in run
    local=local, show_base=show_base)
  File "/usr/lib/python2.7/dist-packages/bzrlib/decorators.py", line 218, in write_locked
    result = unbound(self, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/workingtree.py", line 999, in pull
    local=local)
  File "/usr/lib/python2.7/dist-packages/bzrlib/branch.py", line 1111, in pull
    possible_transports=possible_transports, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/git/branch.py", line 842, in pull
    _override_hook_target, _hook_master=master_branch)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/git/branch.py", line 780, in _basic_pull
    self.target.tags, overwrite, ignore_master=True)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/git/branch.py", line 207, in merge_to
    overwrite=overwrite)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/git/branch.py", line 174, in _merge_to_non_git
    for n, peeled, unpeeled, bzr_revid in self._iter_tag_refs(refs):
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/git/branch.py", line 121, in _iter_tag_refs
    self.branch.lookup_foreign_revision_id(peeled))
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/git/branch.py", line 492, in lookup_foreign_revision_id
    self.mapping)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/git/repository.py", line 430, in lookup_foreign_revision_id
    commit = self._git.object_store.peel_sha(foreign_revid)
  File "/usr/lib/python2.7/dist-packages/dulwich/object_store.py", line 213, in peel_sha
    obj = self[sha]
  File "/usr/lib/python2.7/dist-packages/dulwich/object_store.py", line 115, in __getitem__
    type_num, uncomp = self.get_raw(sha)
  File "/usr/lib/python2.7/dist-packages/dulwich/object_store.py", line 377, in get_raw
    raise KeyError(hexsha)
KeyError: '66531594d8745e0ae7bdeeffea2a6c51c0506cf3'