PHP Core Warning – yii\base\ErrorException

$_GET = [
    'S' => [
        'search' => 'сумка холодильник',
    ],
    'page' => '62',
];

$_COOKIE = [
    '_csrf' => '53030e6bbf7df7715783bd46d7e6c82efa7ab79c2f19d9808d164d6d9726adb0a:2:{i:0;s:5:"_csrf";i:1;s:32:"M6DsvQWnZU2rrUCnR9bX-fVikVYvtpCL";}',
    'PHPSESSID' => 'gv1nl1io27o6k7fk5rkclhattv',
];

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