"Cannot read property 'add' of undefined" error when using iFrame processor

Hello Frontity community,

I’m running into a “Cannot read property ‘add’ of undefined” error when trying to add an iframe to my site. I’m importing the iframe processor from Frontity in my theme’s root and I’m adding the iframe in my WP admin.

As a test, I used the iframe component to import a youtube video. If I add the component and save the file, the iframe renders on the page. When I refresh the page the error is thrown again.

Unfortunately this repository is private, but I’m happy to provide more screenshots/details as necessary.