WP Super cache creates “Uncaught TypeError”

Resolved berlinrob
(@berlinrob)

1 year, 10 months ago

For some days now I daily get an error message from WordPress saying my website has a “technical error”.

In the error details it says the following (in German due to my localization):

WordPress-Version 6.5.3
Aktives Theme: OceanWP (Version 3.5.5)
Aktuelles Plugin: WP Super Cache (Version 1.12.1)
PHP-Version 8.2.18 Fehler-Details

Ein Fehler vom Typ E_ERROR wurde in der Zeile 2937 der Datei /srv/www/htdocs/mydomainname/wp-content/plugins/wp-super-cache/wp-cache.php verursacht. Fehlermeldung: Uncaught TypeError: array_unshift(): Argument #1 ($array) must be of type array, null given in /srv/www/htdocs/mydomainname/wp-content/plugins/wp-super-cache/wp-cache.php:2937
Stack trace: 0 /srv/www/htdocs/mydomainname/wp-content/plugins/wp-super-cache/wp-cache.php(2937): array_unshift() 1 /srv/www/htdocs/mydomainname/wp-includes/class-wp-hook.php(326): wp_cache_plugin_actions() 2 /srv/www/htdocs/mydomainname/wp-includes/plugin.php(205): WP_Hook->apply_filters() 3 /srv/www/htdocs/mydomainname/wp-content/plugins/jetpack/jetpack_vendor/automattic/jetpack-sync/src/modules/class-callables.php(377): apply_filters() 4 /srv/www/htdocs/mydomainname/wp-includes/class-wp-hook.php(324): Automattic\Jetpack\Sync\Modules\Callables->set_plugin_action_links() 5 /srv/www/htdocs/mydomainname/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() 6 /srv/www/htdocs/mydomainname/wp-includes/plugin.php(517): WP_Hook->do_action() 7 /srv/www/htdocs/mydomainname/wp-admin/includes/class-wp-screen.php(424): do_action() 8 /srv/www/htdocs/mydomainname/wp-admin/includes/screen.php(243): WP_Screen->set_current_screen() 9 /srv/www/htdocs/mydomainname/wp-content/plugins/jetpack/jetpack_vendor/automattic/jetpack-sync/src/class-sender.php(527): set_current_screen() 10 /srv/www/htdocs/mydomainname/wp-content/plugins/jetpack/jetpack_vendor/automattic/jetpack-sync/src/class-sender.php(629): Automattic\Jetpack\Sync\Sender->get_items_to_send() 11 /srv/www/htdocs/mydomainname/wp-content/plugins/jetpack/jetpack_vendor/automattic/jetpack-sync/src/class-sender.php(484): Automattic\Jetpack\Sync\Sender->do_sync_for_queue() 12 /srv/www/htdocs/mydomainname/wp-content/plugins/jetpack/jetpack_vendor/automattic/jetpack-sync/src/class-sender.php(359): Automattic\Jetpack\Sync\Sender->do_sync_and_set_delays() 13 /srv/www/htdocs/mydomainname/wp-content/plugins/jetpack/jetpack_vendor/automattic/jetpack-sync/src/class-actions.php(739): Automattic\Jetpack\Sync\Sender->do_sync() 14 /srv/www/htdocs/mydomainname/wp-content/plugins/jetpack/jetpack_vendor/automattic/jetpack-sync/src/class-actions.php(679): Automattic\Jetpack\Sync\Actions::do_cron_sync_by_type() 15 /srv/www/htdocs/mydomainname/wp-includes/class-wp-hook.php(324): Automattic\Jetpack\Sync\Actions::do_cron_sync() 16 /srv/www/htdocs/mydomainname/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() 17 /srv/www/htdocs/mydomainname/wp-includes/plugin.php(565): WP_Hook->do_action() 18 /srv/www/htdocs/mydomainname/wp-cron.php(191): do_action_ref_array() 19 {main}

thrown

Do you have any idea how to get rid of this error?
Many thanks in advance.

Viewing 7 replies - 1 through 7 (of 7 total)

Plugin Author Donncha O Caoimh (a11n)
(@donncha)

1 year, 10 months ago

That’s a really weird one. A bug I’ve never seen before. Do you have any other plugin/code that interacts with the plugin_action_links filter that modifies the links displayed under plugins on the Plugins page? You could search for the string “plugin_action_links” in your plugins folder and see if any plugin messes with it. Disable the plugin to test if the error goes away.
Thread Starter berlinrob
(@berlinrob)

1 year, 10 months ago
```
Hm, I currently have 14 plugins active:


AAWP
Version 3.30.9

Akismet Anti-spam: Spam Protection
Version 5.3.2

consentmanager
Version 3.0.6

Jetpack
Version 13.4.3

Jetpack Protect
Version 2.1.0

Kirki Customizer Framework
Version 5.1.0

Limit Login Attempts
Version 1.7.2

Ocean Extra
Version 2.2.7

Ocean Posts Slider
Version 2.0.6

Print, PDF & Email by PrintFriendly
Version 5.5.2

Quality Media Network
Version 1.17.0

Statebuilt Facebook Page Like Popup

WP Super Cache
Version 1.12.1

wp-Typography
```
I searched with the string you mentioned in my plugin folder, but nothing came up.
Plugin Author Donncha O Caoimh (a11n)
(@donncha)

1 year, 10 months ago

On your Plugins page, in the WP Super Cache entry, do you see this below the name of the plugin?

“Settings | Deactivate”

They should be links. The warning comes because the list of links is empty, but it should have a “Deactivate” link there by default.
Thread Starter berlinrob
(@berlinrob)

1 year, 10 months ago
Yes, I see this below the plugin name, in German though since I use WP with German localization.

Here is a screenshot, the “Deactivate” link can be seen on the bottom left part of the screenshot:

https://ibb.co/vLbBmk3
- This reply was modified 1 year, 10 months ago by berlinrob.
- This reply was modified 1 year, 10 months ago by berlinrob.
Plugin Author Donncha O Caoimh (a11n)
(@donncha)

1 year, 10 months ago
I’ll have to add a check to make sure $links is an array and if it’s not, then skip adding the Settings link. We’ll get that fixed in the next release. If you want to hide the warning until then, comment out or delete the add_filter line on line 2941 of wp-cache.php
```
add_filter( 'plugin_action_links', 'wp_cache_plugin_actions', 10, 2 );
```
Thread Starter berlinrob
(@berlinrob)

1 year, 10 months ago

Thanks for the info.
I am not so tech savvy, so I prefer to wait for the update instead of tinkering with the php-files myself.

Plugin Support Stef (a11n)
(@erania-pinnera)

1 year, 10 months ago

Hi @berlinrob,

That’s fair enough. I checked with our developers, and we might have a new plugin update release in around two weeks. However, it also depends on how well the release passes the necessary tests to confirm the deployment, so it could be slightly delayed.

We hope you can’t wait for it!