Cannot exclude products based on special price in Coupon promo.

[ioweb-gr]

I am trying to create a cart rule with a specific coupon that will work

Preconditions (*)

1. Openmage LTS 20.0.20
2. Openmage LTS 20.0.13

Steps to reproduce (*)

1. Set special_price attribute as used for promo rules.
2. Create a new cart rule with a specific coupon.
3. In actions tab, Apply the rule only to cart items matching the following conditions (leave blank for all items), use rule
   If all conditions are true ->Special Price less than 0.1 or equals or less than 0.
4. Add product to cart and try to apply coupon code.

Expected result (*)

1. If the product doesn't have a special price the coupon code is applied and discount is given.
2. If the product has a special price than the rule should not be applied.

Actual result (*)

1. The coupon code isn't applied with the message: Coupon code "AnnaMaria" is not valid.

Some more information:

If the user switches up the rules to all conditions are false and special price greater than 0 then the coupon is applied regardless if the product has special price or not. This worked flawlessly in Magento 1.9.4.5. I have a hunch that the rule is checking against NULL and that's why it fails.

[sreichel]

Up. For some attention.