PHP Core Warning – yii\base\ErrorException

$_GET = [
    'S' => [
        'search' => 'сумка холодильник',
    ],
    'page' => '6',
];

$_COOKIE = [
    'PHPSESSID' => 'cud13cnjejhbrv6vh1akpgnsfm',
    '_csrf' => 'c1e988b765833e35ff26a695c667d17dba636db5c04d82db915c512692e1a858a:2:{i:0;s:5:"_csrf";i:1;s:32:"LNnH7FHH1aMp8uk2VDHm21PduOSr-mz-";}',
];

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