PHP Core Warning – yii\base\ErrorException

$_GET = [
    'redirect_url' => '/yjds2016/cases/match',
];

$_COOKIE = [
    'PHPSESSID' => '44gcl3c1u367tratcd56v38i71',
    'topics-session' => '1791228066.085.16615.928844|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => '13096fa0c4f5f7785a1d6c3ec07a97c098c37eb6f63f92e0190e55acd81834f9a:2:{i:0;s:5:"_csrf";i:1;s:32:"c6zD5Kl50oiYkv8H3Fy2a7i9rOeb80-6";}',
];