strategy.rb in warden-github-0.8.1

- old
+ new

@@ -5,9 +5,10 @@
     @params ||= Rack::Utils.parse_query(request.query_string)
   end
 
   def authenticate!
     if(params['code'] && params['state'] &&
+       env['rack.session']['github_oauth_state'].any? &&
        params['state'] == env['rack.session']['github_oauth_state'])
       begin
         api = api_for(params['code'])
 
         success!(Warden::Github::Oauth::User.new(Yajl.load(user_info_for(api.token)), api.token))