id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	appname	phpversion	exts	sapi	probability	blockedby	blocking
288	AttributeError: 'NoneType' object has no attribute 'lower'	ckujau	moo	"
==== How to Reproduce ====

While doing a GET operation on `/`, Trac issued an internal error.

''(please provide additional details here)''



User Agent was: `Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20100101 Firefox/13.0`

==== System Information ====

|| '''Trac''' || `0.11.7` ||
|| '''Python''' || `2.6.6 (r266:84292, Dec 26 2010, 22:31:48) ` [[br]] `[GCC 4.4.5]` ||
|| '''setuptools''' || `0.6` ||
|| '''SQLite''' || `3.7.3` ||
|| '''pysqlite''' || `2.4.1` ||
|| '''Genshi''' || `0.6` ||
|| '''Pygments''' || `1.3.1` ||
|| '''Subversion''' || `1.6.12 (r955767)` ||
|| '''jQuery:''' || `1.2.6` ||

==== Python Traceback ====
{{{
Traceback (most recent call last):
  File ""/usr/local/lib/python2.6/dist-packages/Trac-0.11.7-py2.6.egg/trac/web/main.py"", line 452, in _dispatch_request
    dispatcher.dispatch(req)
  File ""/usr/local/lib/python2.6/dist-packages/Trac-0.11.7-py2.6.egg/trac/web/main.py"", line 178, in dispatch
    chosen_handler)
  File ""/usr/local/lib/python2.6/dist-packages/Trac-0.11.7-py2.6.egg/trac/web/main.py"", line 298, in _pre_process_request
    chosen_handler = filter_.pre_process_request(req, chosen_handler)
  File ""/usr/local/lib/python2.6/dist-packages/TracWikiNegotiator-1.6-py2.6.egg/wikinegotiator/negotiator.py"", line 92, in pre_process_request
    page = self._decide_page(req)
  File ""/usr/local/lib/python2.6/dist-packages/TracWikiNegotiator-1.6-py2.6.egg/wikinegotiator/negotiator.py"", line 284, in _decide_page
    for lang in util.get_preferred_langs(req, self._default_lang):
  File ""/usr/local/lib/python2.6/dist-packages/TracWikiNegotiator-1.6-py2.6.egg/wikinegotiator/util.py"", line 112, in get_preferred_langs
    langs = _parse_langs(req.get_header('accept-language').lower()
AttributeError: 'NoneType' object has no attribute 'lower'

}}}
    "	defect	closed	major	misc	website		fixed			trac			Irrelevant	Always