Crashing when click right on the journal tree

[P. Mergey]

Greetings,

I just experienced a crash when I right-clicked on a revision in the tree view of the newspaper (in case it is useful, I specify that this revision is tagged). Bazaar displays the following traceback:

bzr: ERROR: exceptions.KeyError: 'key <email address hidden> not in nodes'

Traceback (most recent call last):
  File "C:/Program Files (x86)/Bazaar/plugins\qbzr\lib\logwidget.py", line 600, in show_context_menu
  File "C:/Program Files (x86)/Bazaar/plugins\qbzr\lib\logwidget.py", line 590, in filter_rev_ancestor
  File "C:/Program Files (x86)/Bazaar/plugins\qbzr\lib\logwidget.py", line 636, in filter_rev_ancestor
  File "_known_graph_pyx.pyx", line 444, in bzrlib._known_graph_pyx.KnownGraph.heads (bzrlib\_known_graph_pyx.c:4180)
KeyError: 'key <email address hidden> not in nodes'

bzr 2.5.1 on python 2.6.6 (win32)
arguments: ['C:\\Program Files (x86)\\Bazaar\\bzrw.exe', 'qlog']
encoding: 'cp1252', fsenc: 'mbcs', lang: None
plugins:
  bzrtools C:\Program Files (x86)\Bazaar\plugins\bzrtools [2.5.0]
  changelog_merge C:\Program Files (x86)\Bazaar\plugins\changelog_merge [2.5.1]
  colo C:\Program Files (x86)\Bazaar\plugins\colo [0.4.0]
  explorer C:\Program Files (x86)\Bazaar\plugins\explorer [1.2.2]
  fastimport C:\Program Files (x86)\Bazaar\plugins\fastimport [0.14.0dev]
  git C:\Program Files (x86)\Bazaar\plugins\git [0.6.8]
  launchpad C:\Program Files (x86)\Bazaar\plugins\launchpad [2.5.1]
  loom C:\Program Files (x86)\Bazaar\plugins\loom [2.3.0dev]
  netrc_credential_store C:\Program Files (x86)\Bazaar\plugins\netrc_credential_store [2.5.1]
  news_merge C:\Program Files (x86)\Bazaar\plugins\news_merge [2.5.1]
  pipeline C:\Program Files (x86)\Bazaar\plugins\pipeline [1.4.0]
  qbzr C:\Program Files (x86)\Bazaar\plugins\qbzr [0.22.3]
  rewrite C:\Program Files (x86)\Bazaar\plugins\rewrite [0.6.4dev]
  svn C:\Program Files (x86)\Bazaar\plugins\svn [1.2.2]
  upload C:\Program Files (x86)\Bazaar\plugins\upload [1.2.0dev]
  xmloutput C:\Program Files (x86)\Bazaar\plugins\xmloutput [0.8.8]