Mongrel: Error calling Dispatcher.dispatch #

I was trying to get Redmine with mongrel and nginx working. Every time I've tried to log me in, mongrel reported the following error message:

Fri Jun 10 05:21:20 +0000 2011: Error calling Dispatcher.dispatch
#<NoMethodError: undefined method `[]' for nil:NilClass>
/usr/lib/ruby/1.8/mongrel/cgi.rb:108:in `send_cookies'
/usr/lib/ruby/1.8/mongrel/cgi.rb:136:in `out'
/usr/lib/ruby/1.8/mongrel/http_response.rb:65:in `start'
/usr/lib/ruby/1.8/mongrel/cgi.rb:135:in `out'
/usr/lib/ruby/1.8/mongrel/rails.rb:81:in `process'
/usr/lib/ruby/1.8/mongrel.rb:159:in `process_client'
/usr/lib/ruby/1.8/mongrel.rb:158:in `each'
/usr/lib/ruby/1.8/mongrel.rb:158:in `process_client'
/usr/lib/ruby/1.8/mongrel.rb:285:in `run'
/usr/lib/ruby/1.8/mongrel.rb:285:in `initialize'
/usr/lib/ruby/1.8/mongrel.rb:285:in `new'
/usr/lib/ruby/1.8/mongrel.rb:285:in `run'
/usr/lib/ruby/1.8/mongrel.rb:268:in `initialize'
/usr/lib/ruby/1.8/mongrel.rb:268:in `new'
/usr/lib/ruby/1.8/mongrel.rb:268:in `run'
/usr/lib/ruby/1.8/mongrel/configurator.rb:282:in `run'
/usr/lib/ruby/1.8/mongrel/configurator.rb:281:in `each'
/usr/lib/ruby/1.8/mongrel/configurator.rb:281:in `run'
/usr/bin/mongrel_rails:129:in `run'
/usr/lib/ruby/1.8/mongrel/command.rb:212:in `run'
/usr/bin/mongrel_rails:282

I've created a patch for mongrel, which will fix this problem. You can find it here: https://gist.github.com/1018287