PHP warning on many pages

My website now begins to get the following error on many of the pages even though the site still works, but it really is very annoying. You can see the error on the homepage below the login area. And I do have the PRO version. But here is the error I keep getting.

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

Any help?

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