KeyError when aborting pack repo write group

[Adrian Wilkins]

D:\bzr\mim>bzr pull svn+http://commsg1lds/svn/mim/trunk
bzr: ERROR: exceptions.KeyError: u'file:///D:/bzr/mim/.bzr/repository/upload/js49ppxas9s7n47290uk.pack'

Traceback (most recent call last):
  File "C:\Python25\Lib\site-packages\bzrlib\commands.py", line 806, in run_bzr_catch_errors
    return run_bzr(argv)
  File "C:\Python25\Lib\site-packages\bzrlib\commands.py", line 762, in run_bzr
    ret = run(*run_argv)
  File "C:\Python25\Lib\site-packages\bzrlib\commands.py", line 492, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "C:\Python25\Lib\site-packages\bzrlib\builtins.py", line 646, in run
    possible_transports=possible_transports)
  File "C:\Python25\Lib\site-packages\bzrlib\decorators.py", line 167, in write_locked
    self.unlock()
  File "C:\Python25\Lib\site-packages\bzrlib\workingtree_4.py", line 1134, in unlock
    self.branch.unlock()
  File "C:\Python25\Lib\site-packages\bzrlib\branch.py", line 1366, in unlock
    self.repository.unlock()
  File "C:\Python25\Lib\site-packages\bzrlib\repofmt\pack_repo.py", line 2005, in unlock
    self.abort_write_group()
  File "C:\Python25\Lib\site-packages\bzrlib\repository.py", line 482, in abort_write_group
    self._abort_write_group()
  File "C:\Python25\Lib\site-packages\bzrlib\repofmt\pack_repo.py", line 1847, in _abort_write_group
    self._pack_collection._abort_write_group()
  File "C:\Python25\Lib\site-packages\bzrlib\repofmt\pack_repo.py", line 1651, in _abort_write_group
    self._new_pack.abort()
  File "C:\Python25\Lib\site-packages\bzrlib\repofmt\pack_repo.py", line 318, in abort
    self.write_stream.close()
  File "C:\Python25\Lib\site-packages\bzrlib\transport\__init__.py", line 281, in close
    del _file_streams[self.transport.abspath(self.relpath)]
KeyError: u'file:///D:/bzr/mim/.bzr/repository/upload/js49ppxas9s7n47290uk.pack'

bzr 1.1.0 on python 2.5.1.final.0 (win32)
arguments: ['C:\\Python25\\Scripts\\bzr', 'pull', 'svn+http://commsg1lds/svn/mim/trunk']
encoding: 'cp1252', fsenc: 'mbcs', lang: None
plugins:
  difftools d:\Documents and Settings\adwi2\Application Data\bazaar\2.0\plugins\difftools [0.91.0]
  gtk d:\Documents and Settings\adwi2\Application Data\bazaar\2.0\plugins\gtk [0.94.0dev0]
  launchpad C:\Python25\lib\site-packages\bzrlib\plugins\launchpad [unknown]
  multiparent C:\Python25\lib\site-packages\bzrlib\plugins\multiparent.pyc [unknown]
  svn d:\Documents and Settings\adwi2\Application Data\bazaar\2.0\plugins\svn [0.4.7]
  xml d:\Documents and Settings\adwi2\Application Data\bazaar\2.0\plugins\xml [0.4.1]
*** 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.