I'm experiencing this error on my site quite often:

Exception #0 (Magento\Framework\Exception\NoSuchEntityException): No such entity with cartId =

It's not using multiple stores, so the entity_ids are not an issue as stated in many other solutions I have tried.

Need this error fixed, can't find anything helpful anywhere else.

  • Where have you this error, in which page ? did you make some changes recently ? – Aamir Sep 6 '18 at 15:53
  • Literally aftering adding a product to the cart and going to cart from the product page we get this error. Haven't made any changes to the checkout files recently. – Howliee Sep 6 '18 at 15:56
  • Did you recently upgrade magento version ? – Pawan Sep 6 '18 at 16:03
  • So when you add a product to cart, a product is added well to cart and when you go to cart you have this message and the cart is not displayed right – Aamir Sep 6 '18 at 16:05
  • That's correct Prince yeah and no Pawan I'm using the latest version – Howliee Sep 6 '18 at 16:05

I see a lot of people are having issues with this. It also seems there might be quite a lot of different causes. I would like to share mine in case someone else is pulling out their hair (like I did).

In my case the firefox plugin uMatrix was causing the issue.

I described it here https://github.com/magento/magento2/issues/5847#issuecomment-496153411

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