can't convert nil into String (TypeError) /usr/local/tdiary/tdiary/filter/antirefspam.rb:128:in `join' /usr/local/tdiary/tdiary/filter/antirefspam.rb:128:in `referer_filter' /usr/local/tdiary/tdiary.rb:1074:in `referer_filter' /usr/local/tdiary/tdiary.rb:1073:in `each' /usr/local/tdiary/tdiary.rb:1073:in `referer_filter' /usr/local/tdiary/tdiary.rb:1455:in `initialize' /usr/local/tdiary/tdiary.rb:1529:in `initialize' /home/sites/www.kankanbou.com/web/rock/index.rb:37:in `new' /home/sites/www.kankanbou.com/web/rock/index.rb:37