Website breaks after update to v3.0

[stormgrass]

I tried updating two of my Wordpress installs to the latest package (v3.0.0), and it results in a critical, not very verbose, error message.

"There has been a critical error on this website.

Learn more about troubleshooting WordPress."

I tried renaming the entire plugins folder while in recovery mode, in order to find out whether it's a specific plugin, but the result is the same.

Any ideas what might be going on here?

[msbt]

@stormgrass PHP got upgraded to 8.1, make sure your plugins and themes are ready for that before updating.

[jdaviescoates]

@stormgrass said in Website breaks after update to v3.0:

I tried renaming the entire plugins folder while in recovery mode, in order to find out whether it's a specific plugin, but the result is the same.

Sounds like it's probably a theme then.

[stormgrass]

@jdaviescoates Thank you! Apparently it was one of my plugins, but they needed to be deactivated manually, simply renaming the folder didn't work. I guess I'm gonna do that with my other installs now and see which one it is there that breaks the site.

[robi]

@stormgrass which plugin?

[scooke]

I've had this happen to me. The quickest for me was to just restore from the most recent working backup. You are backing up, right? And yes, as @jdaviescoates says, it's definitely a plugin or theme not ready for 8.1. I suggest restoring to one of your backups, and work from within the functioning WP to deactivate the problematic plugin/theme, then upgrade.

[p44]

@stormgrass You have to go to wp-config.php and enable DEBUG mode to understand if plugin or theme is blocking.

Insinde wp-confing.php you will find:

define( 'WP_DEBUG', false );
define( 'WP_DEBUG_LOG', false );
define( 'WP_DEBUG_DISPLAY', false );

change to

define( 'WP_DEBUG', true );
define( 'WP_DEBUG_LOG', false );
define( 'WP_DEBUG_DISPLAY', true );

And you will see on the screen what is blocking your Wordpress instance.