PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791666897',
];

$_COOKIE = [
    'topics-session' => '1791766951.507.16477.526702|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => '0ii69uq42vh7cpda6jjhf8phb0',
    '_csrf' => '2561822b93e7be6e43f6f61537d0ed0b4da08db580534cfe4ac00bd5e5c65d0ea:2:{i:0;s:5:"_csrf";i:1;s:32:"hQQPEVLXBcezvrnO6O9zZC_twLfT8YS_";}',
];

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