bzr internal error asked me to report...

[Dave Nadler]

bzr: ERROR: exceptions.TypeError: list indices must be integers, not NoneType

Traceback (most recent call last):
  File "C:/Program Files/Bazaar/plugins\qbzr\lib\uifactory.py", line 32, in decorate
  File "C:/Program Files/Bazaar/plugins\explorer\lib\wt_browser.py", line 672, in remove
  File "C:/Program Files/Bazaar/plugins\qbzr\lib\uifactory.py", line 32, in decorate
  File "C:/Program Files/Bazaar/plugins\qbzr\lib\treewidget.py", line 2076, in remove
  File "C:/Program Files/Bazaar/plugins\qbzr\lib\treewidget.py", line 1573, in refresh
  File "C:/Program Files/Bazaar/plugins\qbzr\lib\treewidget.py", line 1554, in restore_state
  File "C:/Program Files/Bazaar/plugins\qbzr\lib\treewidget.py", line 1134, in refs2indexes
  File "C:/Program Files/Bazaar/plugins\qbzr\lib\treewidget.py", line 1128, in ref2index
  File "C:/Program Files/Bazaar/plugins\qbzr\lib\treewidget.py", line 743, in _index_from_id
TypeError: list indices must be integers, not NoneType

bzr 2.5.1 on python 2.6.6 (win32)
arguments: ['C:\\Program Files\\Bazaar\\tbzrcommand.exe', '--command=explorer', '--file=D:\\Dram\\SW']
encoding: 'cp1252', fsenc: 'mbcs', lang: None
plugins:
  bzrtools C:\Program Files\Bazaar\plugins\bzrtools [2.5.0]
  changelog_merge C:\Program Files\Bazaar\plugins\changelog_merge [2.5.1]
  colo C:\Program Files\Bazaar\plugins\colo [0.4.0]
  explorer C:\Program Files\Bazaar\plugins\explorer [1.2.2]
  fastimport C:\Program Files\Bazaar\plugins\fastimport [0.14.0dev]
  git C:\Program Files\Bazaar\plugins\git [0.6.8]
  launchpad C:\Program Files\Bazaar\plugins\launchpad [2.5.1]
  loom C:\Program Files\Bazaar\plugins\loom [2.3.0dev]
  netrc_credential_store C:\Program Files\Bazaar\plugins\netrc_credential_store [2.5.1]
  news_merge C:\Program Files\Bazaar\plugins\news_merge [2.5.1]
  pipeline C:\Program Files\Bazaar\plugins\pipeline [1.4.0]
  qbzr C:\Program Files\Bazaar\plugins\qbzr [0.22.3]
  rewrite C:\Program Files\Bazaar\plugins\rewrite [0.6.4dev]
  svn C:\Program Files\Bazaar\plugins\svn [1.2.2]
  upload C:\Program Files\Bazaar\plugins\upload [1.2.0dev]
  xmloutput C:\Program Files\Bazaar\plugins\xmloutput [0.8.8]