Fatal error: Uncaught TypeError: TUTOR\Course_List::is_public(): Argument #1 ($course_id) must be of type int, null given, called in /home/fuzfvbdn/public_html/wp-content/plugins/tutor/templates/learning-area/index.php on line 37 and defined in /home/fuzfvbdn/public_html/wp-content/plugins/tutor/classes/Course_List.php:494 Stack trace: #0 /home/fuzfvbdn/public_html/wp-content/plugins/tutor/templates/learning-area/index.php(37): TUTOR\Course_List::is_public(NULL) #1 /home/fuzfvbdn/public_html/wp-includes/template-loader.php(132): include('/home/fuzfvbdn/...') #2 /home/fuzfvbdn/public_html/wp-blog-header.php(19): require_once('/home/fuzfvbdn/...') #3 /home/fuzfvbdn/public_html/index.php(17): require('/home/fuzfvbdn/...') #4 {main} thrown in /home/fuzfvbdn/public_html/wp-content/plugins/tutor/classes/Course_List.php on line 494