Not doing ajax Order Review – causing errors

First off I would like to say, I really do love this plugin.

I have noticed a change in the order review php file from since version 2.1.8 till now (2.1.10) that the order_review div cannot load when ajax is running.

Here is the code:

<?php if ( ! is_ajax() ) : ?><div id="order_review"><?php endif; ?>
.....
<?php if ( ! is_ajax() ) : ?></div><?php endif; ?>

If someone would like to make an add on for coupons and extra amount by a click of a button on the checkout page and would like the order review div to be refreshed afterwards.

How do I go about doing this when the above code is in placed?
As it currently disables refreshing using custom ajax.

https://wordpress.org/plugins/woocommerce/