PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791357535',
];

$_COOKIE = [
    'topics-session' => '1791403526.062.16615.705335|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => '1hcpqrcuo3dlibma2ak1lpv8s3',
    '_csrf' => '9baf260c85e4b6f649ba5ef3be2ee34ef24edebc94a4517b206bc8ef2bdff080a:2:{i:0;s:5:"_csrf";i:1;s:32:"ETm4yzg6hSkZAZ9Zitqwh1sDQeemX6R_";}',
];

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