Disable Woocommerce E-mail for specific product

As the title suggests, I am looking to unhook an e-mail notification for a specific product. In this case I am trying to remove the ‘Order Status Completed’ e-mail, for product id ‘21962, 23325 and 23324′(one product in different languages).

I used parts of this code in other functions which worked fine, but when I try it here, all info out of Woocommerce orders disappears leaving me with attached image. When I put ‘$order->get_items();’ in comment the order overview reappears, though of course the function still doesn’t work. What am I doing wrong?

    <?php
    function unhook_confirmed_email( $order, $email_class ) {
    $membershipID = array('21962', '23325', '23324'); //MULTILANG
    $items = $order->get_items();

    $phtml = array();
    foreach( $items as $item ) {
        $pid[] = $item['product_id'];
    }

        if(array_intersect($membershipID, $pid)){
            // Remove completed order emails
            remove_action( 'woocommerce_order_status_completed_notification', array( $email_class->emails['WC_Email_Customer_Completed_Order'], 'trigger' ) );
        }
    }
    ?>

https://i.stack.imgur.com/zn35b.png