Fatal error in Gutenberg plugin 10.2.0

[paaljoachim]

Description

I received a "Your website is having technical difficulties" e-mail (The e-mail is in Norwegian, and am just directly translating to English.)

Web site looked like this (again this is Norwegian):

With the recovery link I was able to login and noticed that the Gutenberg plugin had been deactivated.

Denne utvidelsen kunne ikke lastes riktig og er derfor midlertidig stoppet under gjenopprettingsmodus.

En feil av typen E_ERROR ble forårsaket i linje 59 i filen /home/edwiegjz/religionskritikk.no/wp-content/plugins/gutenberg/lib/block-supports/generated-classname.php. Feilmelding: Uncaught Error: Class 'WP_Block_Supports' not found in /home/edwiegjz/religionskritikk.no/wp-content/plugins/gutenberg/lib/block-supports/generated-classname.php:59 Stack trace: #0 /home/edwiegjz/religionskritikk.no/wp-content/plugins/gutenberg/lib/load.php(117): require() #1 /home/edwiegjz/religionskritikk.no/wp-content/plugins/gutenberg/gutenberg.php(213): require_once('/home/edwiegjz/...') #2 /home/edwiegjz/religionskritikk.no/wp-content/plugins/gutenberg/gutenberg.php(20): gutenberg_pre_init() #3 /home/edwiegjz/religionskritikk.no/wp-settings.php(377): include_once('/home/edwiegjz/...') #4 /home/edwiegjz/religionskritikk.no/wp-config.php(68): require_once('/home/edwiegjz/...') #5 /home/edwiegjz/religionskritikk.no/wp-load.php(37): require_once('/home/edwiegjz/...') #6 /home/edwiegjz/religionskritikk.no/wp-login.php(12): require('/home/edwiegjz/...') #7 {main} thrown

Expected behaviour

No fatal error in the Gutenberg plugin. That the site just works as normal.

Actual behaviour

Fatal error.

WordPress information

• WordPress version: 5.5.3
• Gutenberg version: Versjon 10.2.0
• Are all plugins except Gutenberg deactivated? No
• Are you using a default theme (e.g. Twenty Twenty-One)? No

I assume that the Gutenberg plugin version 10.2.0 will not work in the older WordPress version 5.5.3. Upon perhaps autoupdating that the update caused a fatal error.

[paaljoachim]

I deactivated the Gutenberg plugin 10.2.0.
When I tried to reactivate the plugin the fatal error came back.

Fatal error: Uncaught Error: Class 'WP_Block_Supports' not found in /home/edwiegjz/religionskritikk.no/wp-content/plugins/gutenberg/lib/block-supports/generated-classname.php:59 Stack trace: #0 /home/edwiegjz/religionskritikk.no/wp-content/plugins/gutenberg/lib/load.php(117): require() #1 /home/edwiegjz/religionskritikk.no/wp-content/plugins/gutenberg/gutenberg.php(213): require_once('/home/edwiegjz/...') #2 /home/edwiegjz/religionskritikk.no/wp-content/plugins/gutenberg/gutenberg.php(20): gutenberg_pre_init() #3 /home/edwiegjz/religionskritikk.no/wp-admin/includes/plugin.php(2297): include('/home/edwiegjz/...') #4 /home/edwiegjz/religionskritikk.no/wp-admin/plugins.php(191): plugin_sandbox_scrape('gutenberg/guten...') #5 {main} thrown in /home/edwiegjz/religionskritikk.no/wp-content/plugins/gutenberg/lib/block-supports/generated-classname.php on line 59

[youknowriad]

There's nothing we can do here. That version is incompatible with WP 5.5. It just shouldn't be used there.

[paaljoachim]

That is what I thought.
It should not be possible for autoupdating Gutenberg plugin on an older WP site. As the result seems to create a fatal error. As there can be a lot of sites that will come across this problem.

@desrosj @audrasjb

[youknowriad]

I think we had an issue where the required version was duplicated in both gutenberg.php and readme.txt. So the auto-updater might have been relying on the wrong one. This is was fixed recently in #29646 and will be active in the next version.

[paaljoachim]

Great! Thanks Riad!