Error in code

Hi, i found an undefined variable, which is in use:
$sanitized_user_login = sanitize_user(‘google’ . $user_profile[‘id’]);
There is no $user_profile variable in the google-connect codes

http://ww.wp.xz.cn/extend/plugins/nextend-google-connect/

and the “New user prefix” is duplicated in the google-settings admin page.
In the code, the default value for the second “New user prefix” is “Facebook-”