crash on `bzr mv` of existing added file to another name in same location

C:\projects\testgui\src\testgui\runner>bzr add
adding src/testgui/runner/loggers.py
ignored 4 file(s).
If you wish to add ignored files, please add them explicitly by name. ("bzr ignored" gives a list)

C:\projects\testgui\src\testgui\runner>bzr mv loggers.py logger.py
bzr: ERROR: exceptions.IndexError: list index out of range

Traceback (most recent call last):
  File "bzrlib\commands.pyo", line 835, in exception_to_return_code
  File "bzrlib\commands.pyo", line 1030, in run_bzr
  File "bzrlib\commands.pyo", line 647, in run_argv_aliases
  File "bzrlib\builtins.pyo", line 813, in run
  File "bzrlib\builtins.pyo", line 906, in _run
  File "bzrlib\mutabletree.pyo", line 52, in tree_write_locked
  File "bzrlib\workingtree_4.pyo", line 1245, in rename_one
  File "bzrlib\mutabletree.pyo", line 52, in tree_write_locked
  File "bzrlib\workingtree.pyo", line 1535, in rename_one
  File "bzrlib\mutabletree.pyo", line 52, in tree_write_locked
  File "bzrlib\workingtree_4.pyo", line 1270, in _write_inventory
  File "bzrlib\dirstate.pyo", line 2629, in set_state_from_inventory
  File "bzrlib\dirstate.pyo", line 2797, in update_minimal
IndexError: list index out of range

bzr 1.18.1 on python 2.5.4 (win32)
arguments: ['C:\\Program Files\\Bazaar\\bzr.EXE', 'mv', 'loggers.py', 'logger.py']
encoding: 'cp1252', fsenc: 'mbcs', lang: None
plugins:
  bzrtools C:\Program Files\Bazaar\plugins\bzrtools [1.18]
  launchpad C:\Program Files\Bazaar\plugins\launchpad [1.18.1]
  netrc_credential_store C:\Program Files\Bazaar\plugins\netrc_credential_store [1.18.1]
  qbzr C:\Program Files\Bazaar\plugins\qbzr [0.13.1]
  rebase C:\Program Files\Bazaar\plugins\rebase [0.5.3]
  svn C:\Program Files\Bazaar\plugins\svn [0.6.5]
*** 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.

C:\projects\testgui\src\testgui\runner>bzr st
modified:
  src/testgui/runner/importer.py
  src/testgui/runner/runner.py
unknown:
  src/testgui/runner/logger.py

C:\projects\testgui\src\testgui\runner>bzr --version
Bazaar (bzr) 1.18.1
  Python interpreter: C:\Program Files\Bazaar\python25.dll 2.5.4
  Python standard library: C:\Program Files\Bazaar\lib\library.zip
  bzrlib: C:\Program Files\Bazaar\lib\library.zip\bzrlib
  Bazaar configuration: C:\Documents and Settings\asvetlov\Application Data\bazaar\2.0
  Bazaar log file: C:\Documents and Settings\asvetlov\My Documents\.bzr.log

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http://bazaar-vcs.org/

bzr comes with ABSOLUTELY NO WARRANTY. bzr is free software, and
you may use, modify and redistribute it under the terms of the GNU
General Public License version 2 or later.

next commit was successful and looks like is nothing broken