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

[punbear@…]

How to Reproduce

While doing a POST operation on /admin/accounts/users, Trac issued an internal error.

(please provide additional details here)

Request parameters:

{'__FORM_TOKEN': u'25f0eb17caaf50bda8e301d5',
 'cat_id': u'accounts',
 'panel_id': u'users',
 'path_info': None,
 'remove': u'Remove selected accounts'}

User Agent was: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/525.19 (KHTML, like Gecko) Chrome/1.0.154.53 Safari/525.19

System Information

Trac	0.11
Python	2.5.2 (r252:60911, Oct 5 2008, 19:49:54) [GCC 4.3.2]
setuptools	0.6c9
SQLite	3.5.9
pysqlite	2.4.1
Genshi	0.5
mod_python	3.3.1
Pygments	0.10
Subversion	1.5.1 (r32289)
jQuery:	1.2.3

Python Traceback

Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/trac/web/main.py", line 423, in _dispatch_request
    dispatcher.dispatch(req)
  File "/usr/lib/python2.5/site-packages/trac/web/main.py", line 197, in dispatch
    resp = chosen_handler.process_request(req)
  File "/usr/lib/python2.5/site-packages/trac/admin/web_ui.py", line 109, in process_request
    path_info)
  File "build/bdist.linux-i686/egg/acct_mgr/admin.py", line 117, in render_admin_panel
    return self._do_users(req)
  File "build/bdist.linux-i686/egg/acct_mgr/admin.py", line 197, in _do_users
    self.account_manager.delete_user(account)
  File "build/bdist.linux-i686/egg/acct_mgr/api.py", line 159, in delete_user
    store = self.find_user_store(user)
  File "build/bdist.linux-i686/egg/acct_mgr/api.py", line 228, in find_user_store
    user = ignore_auth_case and user.lower() or user
AttributeError: 'NoneType' object has no attribute 'lower'

[Remy Blank]

This is an issue in the AccountManagerPlugin. Please report the issue to the plugin maintainer.