Home Forums Gutenberg "Updating failed. The response is not a valid JSON response."


"Updating failed. The response is not a valid JSON response."

  • Hi there!

    I have Gutenberg annoying error message “Updating failed. The response is not a valid JSON response.”, when I trying to add a lot content/fields inside one block.

    The content page (Gutenberg json data) and the fields updating ok, even if I see the error.

    For example, I have block with ACF flexible content items, ant I have 2 items inside and there is no error while updating the page:

    But if I want to add more fields/contents etc into flexible fields(Gutenberg json), I have error message:

    I have latest WP and ACF, php-fpm7.2 and NGINX
    Refreshing permalinks not helps, SSL also configured correctly.

    same problems was in Apache and many another different WordPress virtual hostings


  • Problem solved with disabling html minification for json requests.

Viewing 2 posts - 1 through 2 (of 2 total)

You must be logged in to reply to this topic.

We use cookies to offer you a better browsing experience, analyze site traffic and personalize content. Read about how we use cookies and how you can control them in our Cookie Policy. If you continue to use this site, you consent to our use of cookies.