PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791819059',
];

$_COOKIE = [
    'topics-session' => '1791882046.853.17009.130297|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'kkq09kpib2uvv4hb3n7od62js0',
    '_csrf' => '1e59e1f8e85a79bf0c7e2cb0e44f84a624a2790d6ec7e60b859508ad10f54108a:2:{i:0;s:5:"_csrf";i:1;s:32:"71AaxHrNfsLjmVpI8lB_ded6RtnsKOSP";}',
];

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