PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791146264',
];

$_COOKIE = [
    'topics-session' => '1791478968.243.16958.759072|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'm5pt09v341sn3s4pg58c0jqia1',
    '_csrf' => 'eb9ac2010b920b9d576a23a56b515d8bae3018c83014baead7cf18f38d31828ca:2:{i:0;s:5:"_csrf";i:1;s:32:"U6V92hVl_A9UcDyu3ng5nGQGYH65WVzx";}',
];

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