PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791582609',
];

$_COOKIE = [
    'topics-session' => '1791864368.499.16517.402235|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'sjed3msm46pse9fhhb7nuk4rq6',
    '_csrf' => '35755d26c6051f8d8d5c073332f571febee4da5f32e821790041dbcfc53bbe04a:2:{i:0;s:5:"_csrf";i:1;s:32:"2dPpnIb-Ru1vmP6XZJRYTd2DHwqmnyVM";}',
];

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