Mechanize users - Aug 2010 - utf-8 error

Hello,
I am using mechanize to scrap data from a few websites, including
Digg. On Digg from time to time I get the following error:

ArgumentError: invalid byte sequence in UTF-8
testrun.rb:406:in `dump'': can''t dump hash with default proc
(TypeError)

Any idea how could I either fix it, or make mechanize ignore the error
and continue? (it happens when I use the search method, so I''d be
happy if it just keeps searching the rest of the page).

Thank you
Diego