count_mapped_fields returning an error

WP site build on Bedrock and Sage theme, currently running on localhost (Docker container with PHP 8.2.30), I get this error:

/var/www/html/web/app/plugins/contact-form-7-mailchimp-extension/includes/ui/class-cmatic-form-classes.php:81

Cmatic_Form_Classes::count_mapped_fields(): Argument #1 ($cf7_mch) must be of type array, bool given, called in /var/www/html/web/app/plugins/contact-form-7-mailchimp-extension/includes/ui/class-cmatic-form-classes.php on line 46