Fatal error on attempting to send mail

When I activate the mail2web module and run cron or set it to immediate sending and creat a post I receive a blank white page with

Fatal error: Cannot use object of type stdClass as array in /home/vanlies/public_html/gpstsociety/sites/all/modules/mail2web/mail2web.module on line 125

could this be to do with handling HTML emails rather than plain text? this is the only thing I have changed since I last had it working, as well as updatin to the latest version (not dev).

Thanks for your help
Simon