PHP Core Warning – yii\base\ErrorException

$_GET = [
    'S' => [
        'search' => 'рюкзак',
    ],
    'page' => '85',
];

$_COOKIE = [
    'PHPSESSID' => 'epfnr2crn10cr7k29g24fln9a1',
    '_csrf' => 'c01add89f434729efd3b1f9bd2466d7ac9fe318c627abfa20c2f0e98ec26e266a:2:{i:0;s:5:"_csrf";i:1;s:32:"5H9hWYHlv1wkSfIgOsMtKMZVB7C5ojSf";}',
];

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