I can’t add coupon during order creation

Hi,

I can’t add coupon when I create manually new order on backend, it’s standard Woocommerce coupon and it was working before for a long time. And now when I add I have this spinner and it loads endlessly. When I disable your plugin then it’s added immediately. I know it might be a conflict with another plugin but as I said it was working for a long time before so you something changed and it lost compatibility with something. I can give you list of installed plugins.