[Twisted-web] server crashes

I am almost done with my web app. Now just before finalizing the project I noticed that when I request two pages at the same time (e.g. double clicking on a link) my app including twisted just exits. I am almost certain that this behavior has something to do with the fact that I put every request in a seperate thread. My render methode looks pretty much like this: def render(self, request): threads.deferToThread(handleRequest, request).addCallback(\ writeRequestAndFinish, request).addErrback(\ request.processingFailed) return server.NOT_DONE_YET Any idea why this does not work? Do you think there is a problem with accessing the request variable from a different thread? _stephan