PHP Core Warning – yii\base\ErrorException

$_GET = [
    'S' => [
        'search' => 'сумка холодильник',
    ],
    'page' => '90',
];

$_COOKIE = [
    '_csrf' => '5b055ccaa75c1195b34f4963f541f21ffd3bffd84e1e9a064de09362c56c7298a:2:{i:0;s:5:"_csrf";i:1;s:32:"7Zco3-_dvtn2KsDlkkXAwJ_lRTit7cdK";}',
    'PHPSESSID' => '24d0g3s8h6hnfa700hmalggu68',
];

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