TypeError: Cannot read property 'show_ui' of undefined (solved by changing the Caddy setup)

[dana-ross]

Describe the bug
Clicking "Add New" to create a new Post causes Gutenberg to appear briefly, then it's immediately replaced with the "The editor has encountered an unexpected error." screen showing three buttons.

Error is:

TypeError: Cannot read property 'show_ui' of undefined at https://csixty4.com/wp-content/plugins/gutenberg/build/editor/index.js?ver=1533864911:12:289913 at i (https://unpkg.com/[email protected]/lodash.min.js:6:91) at An.filter (https://unpkg.com/[email protected]/lodash.min.js:99:338) at https://csixty4.com/wp-content/plugins/gutenberg/build/editor/index.js?ver=1533864911:12:289878 at yh (https://unpkg.com/[email protected]/umd/react-dom.production.min.js:96:396) at lg (https://unpkg.com/[email protected]/umd/react-dom.production.min.js:120:88) at mg (https://unpkg.com/[email protected]/umd/react-dom.production.min.js:120:386) at gc (https://unpkg.com/[email protected]/umd/react-dom.production.min.js:127:202) at vb (https://unpkg.com/[email protected]/umd/react-dom.production.min.js:126:230) at ub (https://unpkg.com/[email protected]/umd/react-dom.production.min.js:126:65)

The site is running a third-party theme but switching to Twenty Seventeen doesn't fix. There's also an mu-plugin defining a custom taxonomy but removing it doesn't fix – and the error appears to be happening for the Categories taxonomy.

Debugging the code in question points to this code:

return Object(s.filter)(i, function(e) { return e.visibility.show_ui }).map(function(e) {

at that point, e looks like:

e:
description: ""
hierarchical: true
name: "Categories"
rest_base: "categories"
slug: "category"
types: ["post"]
_links: {collection: Array(1), wp:items: Array(1), curies: Array(1)}
proto: Object`

(no show_ui member)

To Reproduce
Steps to reproduce the behavior:

1. Go to WordPress admin (happens when logged in as Administrator or other role)
2. Click on '.Posts' → 'Add New'
3. See error

Expected behavior
Gutenberg editor loads

Desktop (please complete the following information):

• OS: Windows 10
• Browser Chrome
• Version 68.0.3440.106 (Official Build) (64-bit)

[dana-ross]

This is similar to #8456 #8441

I'm not using Cloudflare. WordPress is running in php-fpm behind Caddy web server.

[dana-ross]

Tested with the current .org version of Gutenberg and master from the repo.

[pento]

Thanks for the bug report, @daveross!

What version of WordPress are you running?

Do you have any other plugins installed?

[dana-ross]

WordPress 4.9.8. No other plugins besides Gutenberg and the mu-plugin that registers the taxonomy.

Possibly related to WordPress commit 2f792d442bf771a3aade170cc9cae459f024c57b which removes visibility from the REST API response by default?

[dana-ross]

Closing this for now. Appears to be tied to the Caddy configuration usually recommended:

rewrite { if {path} not_match ^\/wp-admin# to {path} {path}/ /index.php?_url={uri} }

In WP Core, WP_REST_Server accesses $_GET directly, and in this case $_GET only contains _url.

Fixed by changing the Caddy setup for this site so it passes the query string unchanged:

rewrite { if {path} not_match ^\/wp-admin to {path} {path}/ /index.php?{query} }

[pento]

Huh, interesting. Thanks for tracking that down. 🙂

[choujar]

Hi, I'm running on nginx and getting this error straight after upgrading to Wordpress 5.0.

Any ideas? thanks!

[choujar]

Just to confirm, the solution in #9912 worked for me...

#9912 (comment)

[raininja]

Just wanted to report that I've had the same issue with my Caddyfile, and the solution above worked.

#rewrite {
#    if {path} not_match ^\/wp-admin
#    to {path} {path}/ /index.php?_url={uri}
#}

rewrite {
    if {path} not_match ^\/wp-admin
    to {path} {path}/ /index.php?{query} }
}

[talhaimam]

@dana-ross I am running 5.9.3 with PHP FPM and apache2, and I am still seeing this error. Cant seem to make it work, any idea about apache2?