PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791234589',
];

$_COOKIE = [
    'PHPSESSID' => 'jv5pdsgte0u2votu6j5dn997f4',
    'topics-session' => '1791496033.217.17043.814530|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => '560833363c8c2765183c96c92244fa8bdc321e5752e08a060fac7c5cbb70f52ea:2:{i:0;s:5:"_csrf";i:1;s:32:"wGg7l7rdG09XOOtDc7-PVu3PpCYIKGdi";}',
];

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