No cart when item is added

I add an item. There is no animation and no icon of a cart. If i go to any other page there is icon of the floating cart with the added item. If i go back to the page where the item was i cant`t see the cart again. It used to worked ok.
I`m not sure but at the same time i found such error on this particular page:
<
(index):404 Uncaught ReferenceError: ga is not defined
at HTMLDocument.<anonymous> ((index):404)
at i (jquery.js:2)
at Object.fireWith [as resolveWith] (jquery.js:2)
at Function.ready (jquery.js:2)
at HTMLDocument.J (jquery.js:2)
>
There was also recent update of WP on 5.3.3. Nothing else was changed. But i downgraded to the version when the plugin worked ok and there is still this new bug.

Please, help! ??