Shopify plugins — can't update Shopify keys

On a fresh install of the “Shopify product JSON” plugin, I can’t save my Shopify access keys.

The “Shopify product JSON” plugin isn’t a Dato plugin. So I tried all the other Shopify plugins, and they all give the same error. This includes the official Dato Shopify plugin (“Shopify product”).

Thanks for reporting @callum, should be fixed now!