I’ve updated the plugin to the latest version (1.8.3) and the Site Health doesn’t show the PHP warning.
However, the issue still persists. I tried to edit the Course and add a new lesson. On saving the Course, I got the same JSON error.
I then deactivated the Tutor LMS Elementor Addons plugin and tried saving the Course again and didn’t get any error.
So, I think the error is caused by the Tutor LMS Elementor addon plugin.
I created a thread about this problem a week ago and the developers said they will be releasing an update and they marked the thread as resolved.
Still, no update has been released and the problem persists. I’m thinking of moving to a different LMS plugin if the issue isn’t resolved in the next 2 days.
