When I try to save my site in the Gutenberg Editor it just says "Updating failed".

How to fix that?

  • Is there more information in your browsers dev tools? Look under the console for any JS errors or warnings – Tom J Nowell Jan 15 '19 at 18:34

There are many reasons this error can occur. Those two were the most frequent for me:


Open the Javascript Console by pressing F12 and click on the tab "Console". If you see some error message that goes something like cookie_nonce it's a session cookie problem.

The problem solves by just completely logging out and possibly also deleting all cookies of your website.


If you have a webserver you manage on your own it may be that file permissions are wrong.

The instructions here have never failed to resolve my issues so far, so it's worth checking out.

It's those commands:

Add yourself to www-data group:

sudo gpasswd -a "$USER" www-data

Change file permissions:

sudo chown -R "$USER":www-data /var/www
find /var/www -type f -exec chmod 0660 {} \;
sudo find /var/www -type d -exec chmod 2770 {} \;
  • These shouldn't be issues, I'd raise them on the github repo or the core WP trac – Tom J Nowell Jan 15 '19 at 18:35
  • @TomJNowell I admit my own server installation is a bit "dirty" the second cause would probably not happen on a professional hosting service. – Noah Krasser Jan 15 '19 at 20:06

I had the same exact issue with a client site with GoDaddy. Clearing browser and site cache or disabling plugins wouldn't work either. The only workaround was to login and work from an incognito window. In a normal Chrome window it only seemed to work like 1 in 10 times.

In incognito it works normally without any issue.

So I'm assuming there should be something going on with browser configurations or extensions. Not a definite solution but I'm just putting this workaround here for anybody else pulling their hair because of this problem.

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