How to not allow zero value gift certificates

Hi,
I'm running hikashop with the donation plugin. Currently someone can add a zero value gift certificate to the cart. How can that be not allowed?

Hello,

I believe if you set the price of the product to (for example) 1, then if you enter 0, it defaults to 1.

If you set the price of the product to any amount, then the Gift Certificate will show that amount if no value is entered. So the visitor would get a Gift Certificate for nothing that shows that default amount. If a value is entered then the new value overwrites the default value on the generated gift certificate.

Hello,

I cant be sure then, this is really a hikashop product issue.  Can you post in their forum?