Builder breaks when adding Divider field (in a Group)

Was playing around with the builder this morning and when I added a divider field into a group (with a text and key_value field) the page broken on React render with the following JS error:

Uncaught TypeError: o[t.type] is undefined
te meta-box-aio/vendor/meta-box/meta-box-builder/assets/js/app.js?ver=4.0.5:13

Uncaught (in promise) TypeError: o[t.type] is undefined
te meta-box-aio/vendor/meta-box/meta-box-builder/assets/js/app.js?ver=4.0.5:13

From react dev tools:

Warning: Each child in a list should have a unique "key" prop.
Check the render method of be. See https://fb.me/react-warning-keys for more information.

Let me know if you need further information..

Edit: Group code: https://pastebin.com/itVg4uPW