add_additional_fields

Hi once

After installing and enabling the plug-in, in the order tab at the very bottom, this message appears:

Warning: count(): Parameter must be an array or an object that implements Countable in /usr/home/flyfactory/domains/zarebadesign.com/public_html/wp-content/plugins/woocommerce-checkout-manager/includes/view/frontend/class-wooccm-fields-additional.php on line 92

What could be causing this message to appear?

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