Add Custom Field [Email adress] for second recipient invoice

Hi,

Great plugin, thanks!

I created a custom field for a second customer email adress. Now I need that second email adress to also receive the invoice as well as the standard customer email adress.

I found this code but get a fatal error (might conflict with another plugin):

add_filter( 'woocommerce_email_headers', 'wcpdf_email_cc_alternative', 10, 3);

function wcpdf_email_cc_alternative( $headers, $email_id, $order ) {
	if ($email_id == 'customer_completed_order') {
		$alternative_email = get_post_meta( $order->id, '_alternative_email_field', true)
		if ( $alternative_email ) {
			$headers .= 'CC: ' . $alternative_email . "\r\n"; //just repeat this line again to insert another email address in BCC
		}
	}

	return $headers;
}

Does this code needs to be updated? Or it it still the right way?
FYI I changed “_alternative_email_field” with my custom field name.

Thanks in advance