PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791398797',
];

$_COOKIE = [
    'topics-session' => '1791439773.163.16478.253034|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'k7jn063aqimo02ofs6cgrhqoi6',
    '_csrf' => '7fbbac010a59bcfd9dc02e9fd443953a5fd29b180350b8232b15e918a16ae1eba:2:{i:0;s:5:"_csrf";i:1;s:32:"Isyt7zEJWFqPe6RbV_nuiOaxxJ5vI23S";}',
];

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