PHP Core Warning – yii\base\ErrorException

$_GET = [
    'page' => '279',
];

$_COOKIE = [
    'PHPSESSID' => 'vcuoc8n8ht996bogae9crq3b5b',
    '_csrf' => '10914a9758601e173f25b4164dc69cbc0414ece537970abe351dca3a15b1c95fa:2:{i:0;s:5:"_csrf";i:1;s:32:"ynLrhp_e3A4cXtX8h06tGVR7V7f-3WJm";}',
];

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