PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791551930',
];

$_COOKIE = [
    'PHPSESSID' => 'gnk2tgsiekotsgj0q6pauef9t4',
    '_csrf' => 'a463e476f3c894901fe29b968780762f6670a59d5cfd71a725d7d0430050ae2da:2:{i:0;s:5:"_csrf";i:1;s:32:"XzaOs0Hfz2UqhD2nLLFgZY1zGr-lxsVu";}',
    'topics-session' => '1791598008.57.16974.985616|d197bbbd1d400bd72372bc93068ad169',
];

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