Problem with hooks

[trolling]

Hi, 
I'm writing this post because i have problems when i use my hook.
I have tested all the things we can do with hooks and I have the same ending and a similar errors . 
For an exemple and show you what was the problem, I took the hook who can move down an child item.
 That doesn't work corretly and the site crashes.
I'm putting here the error message :

Error: Call to a member function getChild() on null in /var/www/html/includes/hooks/testhook.php:6

Stack trace:

#0 /var/www/html/vendor/whmcs/whmcs-foundation/lib/Hook/Manager.php(0): WHMCS\Utility\SafeInclude::{closure}()

#1 /var/www/html/vendor/illuminate/support/Facades/Facade.php(261): WHMCS\Hook\Manager->run()

#2 /var/www/html/includes/functions.php(0): Illuminate\Support\Facades\Facade::__callStatic()

#3 /var/www/html/vendor/whmcs/whmcs-foundation/lib/ClientArea.php(0): run_hook()

#4 /var/www/html/vendor/whmcs/whmcs-foundation/lib/ClientArea.php(0): WHMCS\ClientArea->outputWithoutExit()

#5 /var/www/html/vendor/whmcs/whmcs-foundation/lib/Http/Message/AbstractViewableResponse.php(0): WHMCS\ClientArea->getOutputContent()

#6 /var/www/html/vendor/laminas/laminas-httphandlerrunner/src/Emitter/SapiEmitter.php(41): WHMCS\Http\Message\AbstractViewableResponse->getBody()

#7 /var/www/html/vendor/laminas/laminas-httphandlerrunner/src/Emitter/SapiEmitter.php(31): Laminas\HttpHandlerRunner\Emitter\SapiEmitter->emitBody()

#8 /var/www/html/clientarea.php(0): Laminas\HttpHandlerRunner\Emitter\SapiEmitter->emit()

#9 {main}

I followed this doc https://developers.whmcs.com/themes/navigation/
I'm entering correctly the name of menu items but I don't know why that doesn't works.
Here is my code if somebody could help me :

use WHMCS\View\Menu\Item as MenuItem;

 

add_hook('ClientAreaPrimarySidebar', 1, function (MenuItem $primarySidebar)

{

    $primarySidebar->getChild('Account')->getChild('Edit Account Details')->moveUp();

});

 

[Evolve Web Hosting]

Sorry I don't know the exact answer but I think it has to use the 'order' function. I never had any luck with the code you're trying to use (caused a site error too).

[LosBooom]

$account = $primarySidebar->getChild('Account');
if (!is_null($account)) {
    $accountDetails = $account->getChild('Edit Account Details');
    if (!is_null($account)) {
        $accountDetails->moveUp();
    }
}

Somewhat late, but it will be useful for history. You must check for the existence of objects before calling them.

[pRieStaKos]

1 hour ago, LosBooom said:

$account = $primarySidebar->getChild('Account');
if (!is_null($account)) {
    $accountDetails = $account->getChild('Edit Account Details');
    if (!is_null($account)) {
        $accountDetails->moveUp();
    }
}

Somewhat late, but it will be useful for history. You must check for the existence of objects before calling them.

In addition to this reply, you need to check the correct  Menu Name (documentation shows how).

If you are trying to getChild() of a menu name that doesn’t exist, you will get the mentioned error (of null).

You need to start from parent, then to child.