A non-null String must be provided to a Text widget

Question

I\'m trying to add the option for the quantity to be adjusted but I get an error saying \"A non-null String must be provided to a Text widget\" How do I provide this, to this co

Answer 1

The value may be empty therefore youre getting a null error try this if its an optional field:

new Text(cart_prod_qty == null ? '' : cart_prod_qty),