PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1790918668',
];

$_COOKIE = [
    'PHPSESSID' => 'p5l6mb3ualhpvdf6pkdhev0dr3',
    'topics-session' => '1790963608.715.16551.480663|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => '9b8780ba585e87056a7e85352113b7adfcce700a69c034269b00dfe198b23896a:2:{i:0;s:5:"_csrf";i:1;s:32:"zpfOgevRduAIUHYkuEtBDRDPJQMoFyLv";}',
];

$_SESSION = [
    '__flash' => [],
];