KeyError: 'captcha_redirect'

[anonymous]

How to Reproduce

While doing a POST operation on /trac, Trac issued an internal error.

(please provide additional details here)

Request parameters:

{'__FORM_TOKEN': u'f9f92953f1d8b6571722a229', 'captcha_response': u'2'}

User Agent was: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.2.8) Gecko/20100722 Firefox/3.6.8 ( .NET CLR 3.5.30729; .NET4.0E)

System Information

Trac	0.11.6
Python	2.5.2 (r252:60911, Jan 4 2009, 22:17:10) [GCC 4.3.2]
setuptools	0.6c11
SQLite	3.5.9
pysqlite	2.3.2
Genshi	0.5.1
mod_python	3.3.1
Pygments	0.10
jQuery:	1.2.6

Python Traceback

Traceback (most recent call last):
  File "/srv/trac/lib/python2.5/site-packages/Trac-0.11.6-py2.5.egg/trac/web/main.py", line 450, in _dispatch_request
    dispatcher.dispatch(req)
  File "/srv/trac/lib/python2.5/site-packages/Trac-0.11.6-py2.5.egg/trac/web/main.py", line 176, in dispatch
    chosen_handler)
  File "/srv/trac/lib/python2.5/site-packages/Trac-0.11.6-py2.5.egg/trac/web/main.py", line 296, in _pre_process_request
    chosen_handler = filter_.pre_process_request(req, chosen_handler)
  File "/srv/trac/lib/python2.5/site-packages/TracSpamFilter-0.3.2dev_r9893-py2.5.egg/tracspamfilter/captcha/api.py", line 96, in pre_process_request
    del req.session['captcha_redirect']
KeyError: 'captcha_redirect'