PHP Core Warning – yii\base\ErrorException

$_GET = [
    'S' => [
        'search' => 'рюкзак',
    ],
    'page' => '35',
];

$_COOKIE = [
    'PHPSESSID' => 'd1d6hsquikduipehguhs5p9leq',
    '_csrf' => '7ca4ef82ee1ec8e0176f3a5dc095625d11207506afc2bbee35c8e29d7f302e86a:2:{i:0;s:5:"_csrf";i:1;s:32:"Ze1iT86AnG_-Y0wy0OJcw9QfNyHkfD2n";}',
];

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