sup talk - Feb 2008 - Exception while composing message from lable list buffer

Hi,
I ran into this once, next time I tried it did not happen.

in inbox window, I pressed L to check mails against each lable,
from that window I pressed c to compose new mail and it blasted.

--- NoMethodError from thread: main
undefined method `<=>'' for nil:NilClass
/usr/lib/ruby/gems/1.8/gems/sup-0.4/lib/sup/buffer.rb:494:in `sort''
/usr/lib/ruby/gems/1.8/gems/sup-0.4/lib/sup/buffer.rb:494:in
`ask_for_contacts''
/usr/lib/ruby/gems/1.8/gems/sup-0.4/lib/sup/util.rb:497:in `send''
/usr/lib/ruby/gems/1.8/gems/sup-0.4/lib/sup/util.rb:497:in
`method_missing''
/usr/lib/ruby/gems/1.8/gems/sup-0.4/lib/sup/modes/compose-mode.rb:23:in
`spawn_nicely''
/usr/lib/ruby/gems/1.8/gems/sup-0.4/bin/sup:259
/usr/bin/sup:16:in `load''
/usr/bin/sup:16

Regards,
Manish