Magento 2 error Recently viewed products

Question

So this error displays on my home page : {"store":"1","currency":"EUR","productCurrentScope":"website","displayTaxes":"2","displayWeee":"0","allowWishlist":false}

The weird thing about this error is that sometimes it does show up and sometimes it will work fine and the recently viewed products will be shown.

Has anyone ever seen this error? Or knows how to fix this?

Thanks