Uncaught WC_Data_Exception: Invalid discount type

Hi there,

We are a platform making API calls to get Orders from customer websites. A customer has this plugin installed, and when it applied a discount to an order it seems to cause this exception:
“Uncaught WC_Data_Exception: Invalid discount type”

They are using an auto coupon to set price to 0 when a duplicate item is added to cart.

The request is a simple request {“method”:”get”,”url”:”https://xxxxxxxxxxx/wp-json/wc/v3/orders} call, either for individual order ID, or date range.