Warnings on my websites all pages Namaste LMS

Hi, I have been using @Namaste! LMS225 for long and suddenly I am getting warnings throughout the website. Whenever I am trying to create a course it redirects me to the blank page but the course gets created.

Warning: Attempt to read property “id” on null in /home/www/my_directory/name/wp-content/plugins/namaste-lms*/models/point.php on line 78

Thanks,