can't convert nil into String:

./handler.rb:185:in `+'
./handler.rb:185:in `get_db'
(eval):16:in `handle_'
./handler.rb:77:in `handle'
/home/i/ags/fe/fcgi/index.fcgi:38
/home/i/ags/fe/fcgi/index.fcgi:21:in `each'
/home/i/ags/fe/fcgi/index.fcgi:21