Plugin Stop Working

hi. the plugin throw me this error on the front end

Warning: Invalid argument supplied for foreach() in /home/clients/e6848a4c8201c7ee96e8a2a0fd4b48d1/web/wp-content/plugins/responsive-accordion-and-collapse/front/ac-content.php on line 58

The page I need help with: [log in to see the link]