Script Error Message when trying to login to WHMCS

Hi,
I get the following error message at the top of my screen when I try to login to WMCS as a client from my wordpress theme.

Warning: stripos() expects parameter 1 to be string, array given in /home/youchoos/public_html/wp/wp-content/plugins/whmcs-wordpresss-integration/whmcs-integration.php on line 452

Please advise.

Thanks,
Chris