Facebook connect

Error message

• Warning: Trying to access array offset on value of type null in fbconnect_prompt_page() (line 15 of /var/www/fotxus/sites/all/modules/fbconnect/fbconnect.pages.inc).
• Warning: Trying to access array offset on value of type null in fbconnect_prompt_page() (line 21 of /var/www/fotxus/sites/all/modules/fbconnect/fbconnect.pages.inc).