PHP Core Warning – yii\base\ErrorException

$_GET = [
    'S' => [
        'search' => 'рюкзак',
    ],
    'page' => '25',
];

$_COOKIE = [
    'PHPSESSID' => 'sib4g5pg3i5hq9a4ev0htid9hk',
    '_csrf' => '2b4092c2a3a8d74c95a7fba7ae40a5c3fc899f8caae99542350764184e37afeea:2:{i:0;s:5:"_csrf";i:1;s:32:"j2RQZo5SR0iRpnypMfqC0W_jJzdGNQgU";}',
];

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