scat.rb ERROR

undefined method `length' for nil:NilClass /usr/local/lib/clipnews/mail2html.rb:313:in `str_from' /usr/local/lib/clipnews/mail2html.rb:523:in `hhead' /usr/lib/cgi-bin/scat.rb:257:in `sprint' /usr/lib/cgi-bin/scat.rb:335:in `
'