Cant create page.

[NightPurrer]

When i try save page, i get "Crikey! There was an error."
Here's the copied info.
Whoops\Exception\ErrorException thrown with message "Trying to access array offset on value of type null"

Stacktrace:

#43 Whoops\Exception\ErrorException in /home/kociemie/SP/user/plugins/admin/classes/adminbasecontroller.php:736
#42 Grav\Common\Debugger:deprecatedErrorHandler in /home/kociemie/SP/user/plugins/admin/classes/adminbasecontroller.php:736
#41 Grav\Plugin\Admin\AdminBaseController:storeFiles in /home/kociemie/SP/user/plugins/admin/classes/admincontroller.php:722
#40 Grav\Plugin\Admin\AdminController:taskSave in /home/kociemie/SP/user/plugins/admin/classes/adminbasecontroller.php:106
#39 Grav\Plugin\Admin\AdminBaseController:execute in /home/kociemie/SP/user/plugins/admin/admin.php:311
#38 Grav\Plugin\AdminPlugin:initializeController in /home/kociemie/SP/user/plugins/admin/admin.php:371
#37 Grav\Plugin\AdminPlugin:onPagesInitialized in /home/kociemie/SP/vendor/symfony/event-dispatcher/EventDispatcher.php:264
#36 Symfony\Component\EventDispatcher\EventDispatcher:doDispatch in /home/kociemie/SP/vendor/symfony/event-dispatcher/EventDispatcher.php:239
#35 Symfony\Component\EventDispatcher\EventDispatcher:callListeners in /home/kociemie/SP/vendor/symfony/event-dispatcher/EventDispatcher.php:73
#34 Symfony\Component\EventDispatcher\EventDispatcher:dispatch in /home/kociemie/SP/system/src/Grav/Common/Grav.php:592
#33 Grav\Common\Grav:fireEvent in /home/kociemie/SP/system/src/Grav/Common/Processors/PagesProcessor.php:52
#32 Grav\Common\Processors\PagesProcessor:process in /home/kociemie/SP/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php:50
#31 Grav\Framework\RequestHandler\RequestHandler:handle in /home/kociemie/SP/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php:62
#30 Grav\Framework\RequestHandler\RequestHandler:handle in /home/kociemie/SP/system/src/Grav/Common/Processors/TwigProcessor.php:38
#29 Grav\Common\Processors\TwigProcessor:process in /home/kociemie/SP/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php:50
#28 Grav\Framework\RequestHandler\RequestHandler:handle in /home/kociemie/SP/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php:62
#27 Grav\Framework\RequestHandler\RequestHandler:handle in /home/kociemie/SP/system/src/Grav/Common/Processors/AssetsProcessor.php:39
#26 Grav\Common\Processors\AssetsProcessor:process in /home/kociemie/SP/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php:50
#25 Grav\Framework\RequestHandler\RequestHandler:handle in /home/kociemie/SP/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php:62
#24 Grav\Framework\RequestHandler\RequestHandler:handle in /home/kociemie/SP/system/src/Grav/Common/Processors/SchedulerProcessor.php:40
#23 Grav\Common\Processors\SchedulerProcessor:process in /home/kociemie/SP/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php:50
#22 Grav\Framework\RequestHandler\RequestHandler:handle in /home/kociemie/SP/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php:62
#21 Grav\Framework\RequestHandler\RequestHandler:handle in /home/kociemie/SP/system/src/Grav/Common/Processors/BackupsProcessor.php:39
#20 Grav\Common\Processors\BackupsProcessor:process in /home/kociemie/SP/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php:50
#19 Grav\Framework\RequestHandler\RequestHandler:handle in /home/kociemie/SP/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php:62
#18 Grav\Framework\RequestHandler\RequestHandler:handle in /home/kociemie/SP/system/src/Grav/Common/Processors/TasksProcessor.php:69
#17 Grav\Common\Processors\TasksProcessor:process in /home/kociemie/SP/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php:50
#16 Grav\Framework\RequestHandler\RequestHandler:handle in /home/kociemie/SP/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php:62
#15 Grav\Framework\RequestHandler\RequestHandler:handle in /home/kociemie/SP/system/src/Grav/Common/Processors/RequestProcessor.php:64
#14 Grav\Common\Processors\RequestProcessor:process in /home/kociemie/SP/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php:50
#13 Grav\Framework\RequestHandler\RequestHandler:handle in /home/kociemie/SP/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php:62
#12 Grav\Framework\RequestHandler\RequestHandler:handle in /home/kociemie/SP/system/src/Grav/Common/Processors/ThemesProcessor.php:38
#11 Grav\Common\Processors\ThemesProcessor:process in /home/kociemie/SP/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php:50
#10 Grav\Framework\RequestHandler\RequestHandler:handle in /home/kociemie/SP/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php:62
#9 Grav\Framework\RequestHandler\RequestHandler:handle in /home/kociemie/SP/system/src/Grav/Common/Processors/PluginsProcessor.php:39
#8 Grav\Common\Processors\PluginsProcessor:process in /home/kociemie/SP/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php:50
#7 Grav\Framework\RequestHandler\RequestHandler:handle in /home/kociemie/SP/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php:62
#6 Grav\Framework\RequestHandler\RequestHandler:handle in /home/kociemie/SP/system/src/Grav/Common/Processors/InitializeProcessor.php:130
#5 Grav\Common\Processors\InitializeProcessor:Grav\Common\Processors\{closure} in /home/kociemie/SP/system/src/Grav/Common/Debugger.php:546
#4 Grav\Common\Debugger:profile in /home/kociemie/SP/system/src/Grav/Common/Processors/InitializeProcessor.php:131
#3 Grav\Common\Processors\InitializeProcessor:process in /home/kociemie/SP/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php:50
#2 Grav\Framework\RequestHandler\RequestHandler:handle in /home/kociemie/SP/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php:62
#1 Grav\Framework\RequestHandler\RequestHandler:handle in /home/kociemie/SP/system/src/Grav/Common/Grav.php:307
#0 Grav\Common\Grav:process in /home/kociemie/SP/index.php:47

[mahagr]

How old admin do you have? Those files have not been there for a couple of years!

[NightPurrer]

I don't know, i installed grav in 2019.

[mahagr]

Can you check that everything is up to date? Plugin updates should delete all content in their directory and reinstall. If the files are still the same, something has gone wrong.