PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791140569',
];

$_COOKIE = [
    'PHPSESSID' => '72s2nf0maqp8dnjvbks6phrhs6',
    'topics-session' => '1791229366.518.16480.352693|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => '5715186210296d4c90fb4277ce6f23594808c28b6d738973b2dc9543db61b716a:2:{i:0;s:5:"_csrf";i:1;s:32:"8bysKD0YlpIQMXBpKwMloEQIvaObdVo9";}',
];

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