Forminator - allow single acceptance of commission submission (specific goal code)

<?php

if ( ! defined( 'ABSPATH' ) ) {
    exit;
} elseif ( defined( 'WP_CLI' ) && WP_CLI ) {
    return;
}

add_filter( 'forminator_custom_form_submit_errors', function( $submit_errors, $form_id, $field_data_array ){

    $acceptance_form_id = 16777; // ID of acceptance form
    $commission_id_field = "hidden-2"; // ID of the hidden field on acceptance form that keeps commission entry ID
    $error_msg = 'This song commission is already accepted!'; // custom error message


    if( empty( $submit_errors ) && ( $form_id == $acceptance_form_id ) ) {

        foreach( $field_data_array as $field ){

            if( $field['name'] === $commission_id_field ) {

                global $wpdb;

                $GLOBALS['comm_error'] = 'available';

                $table_meta = $wpdb->prefix . 'frmt_form_entry_meta';
                $table_entry = $wpdb->prefix . 'frmt_form_entry';
                $found = $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM $table_meta as m LEFT JOIN $table_entry as e ON m.entry_id = e.entry_id WHERE m.meta_key = %s AND m.meta_value=%s AND e.form_id = %d LIMIT 1;", $field['name'], $field['value'], $form_id ) ) ;

                if ( $found ) {

                    error_log( $field['name'] . " " . $field['value'] );

                    error_log( $found );


                    $submit_errors[]['submit'] = $error_msg;
                    $GLOBALS['comm_error'] = $error_msg;
                }
                break;
            }
        }
    }
    return $submit_errors;
}, 10, 3);



add_filter( 'forminator_custom_form_invalid_form_message', 'wpmudev_invalid_form_error', 10, 1 );
function wpmudev_invalid_form_error( $invalid_form_message ){


    if ( ( ! empty( $GLOBALS['comm_error'] ) ) && ( $GLOBALS['comm_error'] !== 'available' ) ) {
        $invalid_form_message = $GLOBALS['comm_error'];
    }

    return $invalid_form_message;
}