Gift Card issue - Removing already applied gift card (x) causes error

[SilverSearcher]

Get error - when you try to remove an applied gift card using (x)

The parameters dictionary contains a null entry for parameter 'giftCardId' of non-nullable type 'System.Int32' for method 'System.Web.Mvc.ActionResult RemoveGiftardCode(Int32)' in 'SmartStore.Web.Controllers.ShoppingCartController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter.
Parameter name: parameters