PHP Core Warning – yii\base\ErrorException

$_GET = [
    'page' => '1083',
];

$_COOKIE = [
    '_csrf' => '251f5137b753ec29add93b01cc083533727aa8bb911074a8f5e686e42dcc2fe5a:2:{i:0;s:5:"_csrf";i:1;s:32:"9F3ZBVlfaq5djhk1IUCEUetcJIOdxNq6";}',
    'PHPSESSID' => 'p441pttq3bpdljtbfcqnpi5pmo',
];

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