Fatal error: Uncaught TypeError: Argument 1 passed to TUTOR\Course_List::is_public() must be of the type int, null given, called in /home/customer/www/abovethebarmarketing.com/public_html/wp-content/plugins/tutor/templates/single-content-loader.php on line 87 and defined in /home/customer/www/abovethebarmarketing.com/public_html/wp-content/plugins/tutor/classes/Course_List.php:426 Stack trace: #0 /home/customer/www/abovethebarmarketing.com/public_html/wp-content/plugins/tutor/templates/single-content-loader.php(87): TUTOR\Course_List::is_public(NULL) #1 /home/customer/www/abovethebarmarketing.com/public_html/wp-content/plugins/tutor/includes/tutor-template-functions.php(1412): include('/home/customer/...') #2 /home/customer/www/abovethebarmarketing.com/public_html/wp-content/plugins/tutor/templates/single-preview-lesson.php(11): tutor_load_template_from_custom_path('/home/customer/...', Array, false) #3 /home/customer/www/abovethebarmarketing.com/public_html/wp-includes/template-loader.php(106): include('/home/customer/.. in /home/customer/www/abovethebarmarketing.com/public_html/wp-content/plugins/tutor/classes/Course_List.php on line 426