We have you Smith Shopping Cart module version 3.99.0. Everything seems to work fine with the product list and the product details page until I add a variant to a product. Once I add a variant to the product the product details page for that product no longer comes up but still does on a product without a variant. The error we receive is
A critical error has occurred.
Object reference not set to an instance of an object.
Is this an issue you have come across and can you fix it or give me a solution?