Urgent domain mapping error

hi, Im having a problem with domain mapping plugin.. When i add a domain it just refreshes the page… i turned debug on and got .

: Trying to get property of non-object in Notice/home/httpd/vhosts/tec6.co.uk/httpdocs/wp-content/plugins/domain-mapping/domain-mapping.php on line 485

I have sunrised defined in the palce you say.