TypeError: 'NoneType' object is unsubscriptable

[vinay.mohan.dass]

How to Reproduce

While doing a POST operation on /admin/discussion/forum, Trac issued an internal error.

(please provide additional details here)

Request parameters:

{'__FORM_TOKEN': u'2635e2d315333c0f49d5b1bd',
 'cat_id': u'discussion',
 'discussion_action': u'delete',
 'group': '-1',
 'panel_id': u'forum',
 'path_info': None,
 'remove': u'Remove selected items',
 'selection': u'2'}

User agent: Mozilla/5.0 (Windows NT 6.0; rv:25.0) Gecko/20100101 Firefox/25.0

System Information

Trac	0.12.3
Trac	0.12.3
Babel	0.9.5
Docutils	0.7
Genshi	0.6
GIT	1.8.4
mod_wsgi	2.5 (WSGIProcessGroup trac_wsgi_01 WSGIApplicationGroup %{GLOBAL})
Pygments	1.4dev-20110115
pysqlite	2.4.1
Python	2.5.2 (r252:60911, Jan 24 2010, 18:02:01) [GCC 4.3.2]
Python	2.5.2 (r252:60911, Jan 24 2010, 18:02:01) [GCC 4.3.2]
pytz	2008c
pytz	2008c
RPC	1.1.2
setuptools	0.6c12
setuptools	0.6c12
SQLite	3.7.3
Subversion	1.8.3 (r1516576)
jQuery	1.4.4

Enabled Plugins

backlinks	N/A
backlinks-menu	N/A
customroadmap.webadminui	N/A
TracAnnouncer	0.12.1.dev
TracCaptcha	0.2.2
TracCustomRoadmap	0.4
TracDiscussion	0.8-r9877
TracDownloads	0.3
TracGit	0.12.0.5dev
TracMarkdownMacro	0.11.1
tracrpc.changeset	N/A
TracTags	0.6
TracTocMacro	11.0.0.3
TracWysiwyg	0.12.0.3-r9676
TracXMLRPC	1.1.2

Python Traceback

Traceback (most recent call last):
  File "/usr/local/lib/python2.5/site-packages/Trac-0.12.3-py2.5.egg/trac/web/main.py", line 522, in _dispatch_request
    dispatcher.dispatch(req)
  File "/usr/local/lib/python2.5/site-packages/Trac-0.12.3-py2.5.egg/trac/web/main.py", line 243, in dispatch
    resp = chosen_handler.process_request(req)
  File "/usr/local/lib/python2.5/site-packages/Trac-0.12.3-py2.5.egg/trac/admin/web_ui.py", line 117, in process_request
    path_info)
  File "/usr/local/lib/python2.5/site-packages/TracDiscussion-0.8_r9877-py2.5.egg/tracdiscussion/admin.py", line 49, in render_admin_panel
    template, data = api.process_discussion(context)
  File "/usr/local/lib/python2.5/site-packages/TracDiscussion-0.8_r9877-py2.5.egg/tracdiscussion/api.py", line 259, in process_discussion
    self._do_actions(context, actions)
  File "/usr/local/lib/python2.5/site-packages/TracDiscussion-0.8_r9877-py2.5.egg/tracdiscussion/api.py", line 880, in _do_actions
    listener.forum_deleted(context, context.forum)
  File "/usr/local/lib/python2.5/site-packages/TracDiscussion-0.8_r9877-py2.5.egg/tracdiscussion/tags.py", line 73, in forum_deleted
    forum['id']))
TypeError: 'NoneType' object is unsubscriptable

[Ryan J Ollos]

Duplicate of #9220. Please upgrade your DiscussionPlugin installation and you will likely find that the issue is fixed. If not, please let us know.