What does BX.debug mean in the console when adding an item to the cart?

Question

1C-Bitrix

The problem is this: when adding a product to the basket, it does not appear there, but if you add the product again (the same or another), it will be displayed in the basket.
Console throws:
ReferenceError: basketJSParams is not defined
at BasketPoolQuantity.updateQuantity

Answer 1

In template.php After BX.Sale.BasketComponent.init({....});
must be added

var basketJSParams = <?=CUtil::PhpToJSObject($arParams)?>

Answer 2

You have a script error.
Have you modified the templates? If not, contact technical support. Perhaps you didn't learn something.