PHP Core Warning – yii\base\ErrorException

$_GET = [
    'S' => [
        'search' => 'коврик',
    ],
    'page' => '5',
];

$_COOKIE = [
    'PHPSESSID' => '6kll90cu9g08c7jeovko1o31th',
    '_csrf' => '92ad421f6f2fb5c749617ddb1b699be14053f0889ba597ea8b3b9c6fdce41410a:2:{i:0;s:5:"_csrf";i:1;s:32:"_lWmr4PCfTUqXqTVgBJ1QgcVTnSubb-b";}',
];

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