[Zope] ZServer uncaptured python exception

We have a Debian linux distribution and zope server has crashed, this is the error: 1999-09-20T22:43:10 ERROR(200) ZServer uncaptured python exception, closing channel <zhttp_server listening :8080 at 84c22e0> (exceptions.TypeError:unpack non-sequence [/storage/pub/Zope-2.0.0-linux2-x86/ZServer/medusa/asyncore.py|poll|59] [/storage/pub/Zope-2.0.0-linux2-x86/ZServer/medusa/asyncore.py|handle_read_event|285] [/storage/pub/Zope-2.0.0-linux2-x86/ZServer/medusa/http_server.py|handle_accept|591]) S.O.S.! :)