Hello, I was just sending another mail when sup crashed with the following stack trace: --- TypeError from thread: periodic poll can''t convert nil into String /home/ash/.rvm/gems/ruby-1.8.7-p352/gems/sup-0.12.1/lib/sup/mbox.rb:141:in `size'' /home/ash/.rvm/gems/ruby-1.8.7-p352/gems/sup-0.12.1/lib/sup/mbox.rb:141:in `poll'' /home/ash/.rvm/gems/ruby-1.8.7-p352/gems/sup-0.12.1/lib/sup/poll.rb:155:in `poll_from'' /home/ash/.rvm/gems/ruby-1.8.7-p352/gems/sup-0.12.1/lib/sup/poll.rb:113:in `do_poll'' /home/ash/.rvm/gems/ruby-1.8.7-p352/gems/sup-0.12.1/lib/sup/poll.rb:103:in `each'' /home/ash/.rvm/gems/ruby-1.8.7-p352/gems/sup-0.12.1/lib/sup/poll.rb:103:in `do_poll'' /home/ash/.rvm/gems/ruby-1.8.7-p352/gems/sup-0.12.1/lib/sup/poll.rb:102:in `synchronize'' /home/ash/.rvm/gems/ruby-1.8.7-p352/gems/sup-0.12.1/lib/sup/poll.rb:102:in `do_poll'' /home/ash/.rvm/gems/ruby-1.8.7-p352/gems/sup-0.12.1/lib/sup/util.rb:609:in `send'' /home/ash/.rvm/gems/ruby-1.8.7-p352/gems/sup-0.12.1/lib/sup/util.rb:609:in `method_missing'' /home/ash/.rvm/gems/ruby-1.8.7-p352/gems/sup-0.12.1/lib/sup/modes/poll-mode.rb:15:in `poll'' /home/ash/.rvm/gems/ruby-1.8.7-p352/gems/sup-0.12.1/lib/sup/poll.rb:49:in `poll_with_sources'' /home/ash/.rvm/gems/ruby-1.8.7-p352/gems/sup-0.12.1/lib/sup/poll.rb:68:in `poll'' /home/ash/.rvm/gems/ruby-1.8.7-p352/gems/sup-0.12.1/lib/sup/poll.rb:86:in `start'' /home/ash/.rvm/gems/ruby-1.8.7-p352/gems/sup-0.12.1/lib/sup.rb:78:in `reporting_thread'' /home/ash/.rvm/gems/ruby-1.8.7-p352/gems/sup-0.12.1/lib/sup.rb:76:in `initialize'' /home/ash/.rvm/gems/ruby-1.8.7-p352/gems/sup-0.12.1/lib/sup.rb:76:in `new'' /home/ash/.rvm/gems/ruby-1.8.7-p352/gems/sup-0.12.1/lib/sup.rb:76:in `reporting_thread'' /home/ash/.rvm/gems/ruby-1.8.7-p352/gems/sup-0.12.1/lib/sup/poll.rb:83:in `start'' /home/ash/.rvm/gems/ruby-1.8.7-p352/gems/sup-0.12.1/lib/sup/util.rb:609:in `send'' /home/ash/.rvm/gems/ruby-1.8.7-p352/gems/sup-0.12.1/lib/sup/util.rb:609:in `method_missing'' /home/ash/.rvm/gems/ruby-1.8.7-p352/gems/sup-0.12.1/bin/sup:222 /home/ash/.rvm/gems/ruby-1.8.7-p352/bin/sup:19:in `load'' /home/ash/.rvm/gems/ruby-1.8.7-p352/bin/sup:19 Sup is installed from rubygems, v0.12. Update: it seems that the message was sent, and the crash happened just after that. -- Regards, Alex