PHP Warning: Undefined variable $field_values in CheckoutFieldsFrontend.php

Thank you for WooCommerce 9.8.1 release.

After changing the password on the My Account screen (/my-account/edit-account/), warning was logged in debug.log below (WooCommerce9.8.1+PHP8.3.10).

[10-Apr-2025 08:55:37 UTC] PHP Warning: Undefined variable $field_values in /***/wp-content/plugins/woocommerce/src/Blocks/Domain/Services/CheckoutFieldsFrontend.php on line 312

protected function get_posted_additional_field_values( $location, $group, $sanitize = true ) {
    $additional_fields = $this->checkout_fields_controller->get_fields_for_location( $location );

    // phpcs:disable WordPress.Security.NonceVerification.Missing
    foreach ( $additional_fields as $field_key => $field_data ) {
        $post_key                   = CheckoutFields::get_group_key( $group ) . $field_key;
        $field_values[ $field_key ] = wc_clean( wp_unslash( $_POST[ $post_key ] ?? '' ) );

        if ( $sanitize ) {
            $field_values[ $field_key ] = $this->checkout_fields_controller->sanitize_field( $field_key, $field_values[ $field_key ] );
        }
    }
    // phpcs:enable WordPress.Security.NonceVerification.Missing
    return $field_values;
}

When the foreach loop does not execute, the $field_values variable remains undefined, which results in a warning being logged.

Thank you for your time and support.