PHP Core Warning – yii\base\ErrorException

$_GET = [
    'page' => '36',
];

$_COOKIE = [
    'PHPSESSID' => 'c48tkgpi2q1e4r2l9rprcgm5k0',
    '_csrf' => 'd9da7aa59b71c7063db0d81849752e0be8710882e42b350b8d6e1eef65822f4fa:2:{i:0;s:5:"_csrf";i:1;s:32:"B4RR6q9jci5pMm-IqMUPe-tVhrEACQEU";}',
];

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