Fatal Error class.wpdatatablerows.php

I’m having issues with editing my pages with tables on them. After about 24 hours passes, I receive an error message when trying to edit pages. I found this support string with the same error but the suggested solution did not work for me: https://www.ads-software.com/support/topic/json_decode-error/

Here is one of the pages that I’m having issues with, however as I said above, the issue is only visible on the backend when trying to edit the page: https://youthfirstinc.org/orange/
I do use a caching plugin but tried removing it and clearing browser cache and still had an error message.

I’m able to fix the problem by duplicating the page, but after about 24 hours, the same error occurs.

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