Error when submitting "Subscribe" form

Hi - my website is andyjohns.co

Some of my website visitors have reported that the submission form (when submitting their email) throws an error:

I think it may have something to do with rate-limiting people that have already visited my website. When I open the site in incognito window it works just fine.

Any clue what’s going on here?


Here is my site Read-Only: LINK
(how to share your site Read-Only link)

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