Sablotron Errors

Hi, Not sure if this has been covered on here but... In recent versions PHP/Sablotron I've found that parse errors in the XML/XSL cause fatal errors. I'd much rather not have this happen so is there a way I can get around it? I'm doing xslt_process( ... ) which is meant to return false on errors so how can I get it to do that again rather than generating a fatal error that stops processing. I've tried putting my own dummy errorhandler in that doesn't do anything but that won't do it. Can you help? John