Can't be sure when or how this broke, but when visiting the Wishlist page or attempting to add a product to my Wishlist I am presented with 'Cannot specify product.' (See attachment)
This functionality was previously working fine. This is happening on my local version and on staging version. Is there a quick/easy way to decipher where the problem is stemming from?
Edit: I've clearly broken something. Console is throwing up a 400, also with the message 'Cannot specify product.'
From what I can gather all my products exist and have IDs. Has anyone experienced anything similar to this with Magento 2?