AttributeError: 'NoneType' object has no attribute 'changeset'

[stromnov@…]

File "/usr/lib/python2.5/site-packages/Trac-0.11-py2.5.egg/trac/web/main.py", line 423, in _dispatch_request
  dispatcher.dispatch(req)
File "/usr/lib/python2.5/site-packages/Trac-0.11-py2.5.egg/trac/web/main.py", line 197, in dispatch
  resp = chosen_handler.process_request(req)
File "/usr/lib/python2.5/site-packages/bitten/web_ui.py", line 128, in process_requestFile "/usr/lib/python2.5/site-packages/bitten/web_ui.py", line 171, in _render_overviewFile "/usr/lib/python2.5/site-packages/Trac-0.11-py2.5.egg/trac/wiki/formatter.py", line 1127, in wiki_to_oneliner
  OneLinerFormatter(env, context).format(wikitext, out, shorten)
File "/usr/lib/python2.5/site-packages/Trac-0.11-py2.5.egg/trac/wiki/formatter.py", line 953, in format
  result = re.sub(self.wikiparser.rules, self.replace, result)
File "re.py", line 142, in subFile "/usr/lib/python2.5/site-packages/Trac-0.11-py2.5.egg/trac/wiki/formatter.py", line 807, in replace
  replacement = self.handle_match(fullmatch)
File "/usr/lib/python2.5/site-packages/Trac-0.11-py2.5.egg/trac/wiki/formatter.py", line 800, in handle_match
  return external_handler(self, match, fullmatch)
File "/usr/lib/python2.5/site-packages/Trac-0.11-py2.5.egg/trac/versioncontrol/web_ui/changeset.py", line 876, in <lambda>
  y, z))
File "/usr/lib/python2.5/site-packages/Trac-0.11-py2.5.egg/trac/versioncontrol/web_ui/changeset.py", line 899, in _format_changeset_link
  params + fragment))

Local variables:

changeset  <trac.versioncontrol.cache.CachedChangeset object at 0x8db650c>
chgset     u'12219'
formatter  <trac.wiki.formatter.OneLinerFormatter object at 0x8db628c>
fragment   ''
fullmatch  <_sre.SRE_Match object at 0x8ac2338>
intertrac  None
label      u'r12219'
ns         'changeset'
params     ''
path       None
rev        u'12219'
self       <trac.versioncontrol.web_ui.changeset.ChangesetModule object at 0x8927c4c>
sep        -1

[cmlenz]

Duplicate of #191. This should have been fixed by r554.

[anonymous]

Unfortunately, this error also appeared at r555.