How to Fix Gutenberg Error: Cannot read property ‘show_ui’

I have installed the last version of WordPress and this one is coming with a new fancy editor called Gutenberg that is completely changed. After starting using it I have seen that when I was trying to change the category and open the tab the interface crashes. The error was as in the below screanshot:

As you can see not a lot off informations so I have hit error and I have seen that the actual error was:

TypeError: Cannot read property 'show_ui' of undefined
at i (
at An.filter (
at ph (
at eg (
at fg (
at wc (
at fa (
at ng (

First I have tried disable all the plugins, this didn’t do the trick and the error was still present.

I have my own VPS and I thought to try update PHP maybe it could help, I have gone from PHP 7.1 to PHP 7.3 but still same issue.

After I have started searching online to see what I can find and there were a couple of topics like issue 10162 where I have seen that the issue may come from an NGINX config. I did the change restated NGINX service and error dissapeared.

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How to Fix Gutenberg Error: Cannot read property ‘show_ui’ in NGINX

In my configuration I was having the below which caused the issue:

try_files $uri $uri/ /index.php?q=$request_uri;

You can also have:

try_files  $uri $uri/ /index.php?q=$uri$args;

To fix the error you just need to replace the above with below and restart nginx service:

try_files  $uri $uri/ /index.php?$args;

That’s all, after doing this the error was gone and I can write posts.

You encounter the error? If so what you did to fix it?

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