PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1790913309',
];

$_COOKIE = [
    'topics-session' => '1791228620.365.16551.592331|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'aj0bd21pl82gas9cbkhk533uj0',
    '_csrf' => '173cdfe2b0c4bead95be8ba9c254744b8e613a276ce9d1153cab4d8e17d85f5ea:2:{i:0;s:5:"_csrf";i:1;s:32:"Al_zDQNmGwbgO29rt6zYHUWmcxq1K0jK";}',
];

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