bazaar shelve from explorer crashes shelving large number of file removes.

In Windows explorer after removing large number of files from version control, selected files to shelve. Hit "Shelve" button, error occurs.

bzr: ERROR: bzrlib.errors.MalformedTransform: Tree transform is malformed [('duplicate', 'new-457', 'new-55', u'dbupgrade.vbw'), ('duplicate', 'new-204', 'new-535', u'transienttest.vbw'), ('duplicate', 'new-124', 'new-759', u'obdtest.vbw'), ('duplicate', 'new-77', 'new-786', u'espforms.vbw'), ('duplicate', 'new-1290', 'new-186', u'spanchkcai.vbw')]

Traceback (most recent call last):
  File "C:/Program Files/Bazaar/plugins\qbzr\lib\widgets\shelve.py", line 715, in do_shelve
  File "bzrlib\shelf.pyo", line 382, in shelve_changes
  File "bzrlib\shelf.pyo", line 256, in transform
  File "bzrlib\transform.pyo", line 1730, in apply
  File "bzrlib\transform.pyo", line 554, in _check_malformed
MalformedTransform: Tree transform is malformed [('duplicate', 'new-457', 'new-55', u'dbupgrade.vbw'), ('duplicate', 'new-204', 'new-535', u'transienttest.vbw'), ('duplicate', 'new-124', 'new-759', u'obdtest.vbw'), ('duplicate', 'new-77', 'new-786', u'espforms.vbw'), ('duplicate', 'new-1290', 'new-186', u'spanchkcai.vbw')]

bzr 2.5.1 on python 2.6.6 (win32)
arguments: ['C:\\Program Files\\Bazaar\\tbzrcommand.exe', '--command=shelve', '--file=D:\\DC\\VB']
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]