CFT and Gutenberg

I’m trying to get ready for Gutenberg and using the Gutenberg plugin but seeing these errors on the admin side of a post. I have donated for quicker support but never heard back. Hopefully will get some answers here. Thank you!

Warning: Illegal offset type in isset or empty in /nas/content/staging/munsllc/wp-content/plugins/custom-field-template/custom-field-template.php on line 1793

Warning: Illegal offset type in /nas/content/staging/munsllc/wp-content/plugins/custom-field-template/custom-field-template.php on line 2421

Warning: Illegal offset type in isset or empty in /nas/content/staging/munsllc/wp-content/plugins/custom-field-template/custom-field-template.php on line 1793