This might help:
https://aristath.github.io/blog/wp-hide-php-errors
Worked for me with a plugin I was having the same problems with.
Hi all,
Had the same problem on my site with a user submission form. Got a response back from the plugin developer that took care of the issue and just thought I’d pass it on. Did the trick for me.
https://aristath.github.io/blog/wp-hide-php-errors
Hope it helps 🙂
Ron
