Enable Laravel Debugbar in AppServiceProvider behavior

Question

I found this Laravel Debugbar I would like to use in my app. But I want to enable it based on a condition. I tried adding my code in both register() and boot() method in the AppServiceProvider, where I put all other similar checks, but both don't work.

When changing the DEBUGBAR_ENABLED in the config, everything works as it should. So I've set the default to false and want to enable it only dynamically. However, I just can't understand why the following happens:

With this code the debugbar works:

public function boot()
{
    \Debugbar::enable();
}

With this code the debugbar throws 404 errors and doesn't work when the condition is met:

public function boot()
{
    if (isset($_GET['debug']) && $_GET['debug'] === 'debugbar') {
        \Debugbar::enable();
    }
}

If anyone has an idea why this is happening, please explain!