[Plugin: Post Affiliate Pro] php error

Hi,

after user signs up in wordpesss i get this error, even if user is registered in wordpress and pap successfully

Fatal error: Call to a member function get() on a non-object in public_html/wp-content/plugins/postaffiliatepro/postaffiliatepro.php on line 340

thank you

http://ww.wp.xz.cn/extend/plugins/postaffiliatepro/