Used to work well, now gives Countable error on PHP 7.2 & 7.3

This plugin used to work fairly well, but it has not been maintained for compatibility with the 7.2+ versions of PHP due to the implementation of Countable. After upgrading one site, I’ve received the following error in the admin console:

Warning: count(): Parameter must be an array or an object that implements Countable in /home/directory/public_html/mysitedirectory/wp-content/plugins/meet-my-team/admin/includes/Custom-Metaboxes-and-Fields/init.php on line 755

Warning: Cannot modify header information - headers already sent by (output started at /home/directory/public_html/mysitedirectory/wp-content/plugins/meet-my-team/admin/includes/Custom-Metaboxes-and-Fields/init.php:755) in /home/directory/public_html/mysitedirectory/wp-admin/includes/misc.php on line 1196

Support has been non-existent for a year (and it hasn’t been updated in three), so I would no longer recommend this plugin.