PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791038667',
];

$_COOKIE = [
    'topics-session' => '1791278047.677.17009.152398|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => '1221cc7eb453cafdf24b21ff0cecbe879958d800a9c6601d8f7cfbd42c637c0ca:2:{i:0;s:5:"_csrf";i:1;s:32:"pF_v9NgCFXwsqcyLRBKEsuNWIRerE2Jn";}',
    'PHPSESSID' => 'jjgehhmajmgovg9kuj4qe4kf97',
];

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