Error when increasing/decreasing/deleting item in the cart

[AMKrucena]

Hello, I have problem with my cart. I am getting big red exclamation mark when increasing/reducing item count and it doesn’t matter if there are multiple item in the cart or only one. Deleting item from my cart, but if there are only one item in the cart and I delete it there isn’t problem. In the inspect element there is one error, but it appears already when simply opening page. When I look in the network tab all request are fine and cart gets all needed data. I was writing to the support but all the solutions (restoring theme.liquid file to older version (I returned it to original state) , then deleting Easy GDPR app and restoring theme page to older version) didn’t help. There are some pictures about my problem. Hope anybody can help resolve this issue. Thanks for your help previously :).