PHP Core Warning – yii\base\ErrorException

$_GET = [
    'page' => '10',
];

$_COOKIE = [
    'PHPSESSID' => '4ir8ed1haiqfjh1rduqmcd6kpt',
    '_csrf' => '446401b2ab7b9a75b37fbf5c19ba6ca71abfe2a8a82cc35750a1f6007a9c510ca:2:{i:0;s:5:"_csrf";i:1;s:32:"D1UloUXRozkPGWBooM282n4xaGROGgX7";}',
];

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