PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791198899',
];

$_COOKIE = [
    'PHPSESSID' => 'ce7mjg8h8valhqe0g93csru6p7',
    '_csrf' => 'e6d2ee528bfb259b2a1472666ac0a04cce6b6d9c21a08fd635295e7cb8927fc0a:2:{i:0;s:5:"_csrf";i:1;s:32:"8spRltA5iZTi-vh0lY65SrSF32vC5jDW";}',
    'topics-session' => '1791482849.786.16517.780419|d197bbbd1d400bd72372bc93068ad169',
];

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