PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791383469',
];

$_COOKIE = [
    'topics-session' => '1791448234.039.16475.162635|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'k7ihgfa90mnqpc6rocpdot88r6',
    '_csrf' => '5ffa8f680e19556c518b91d89ada23646831befa90be1a4f40f0c0b6ea648367a:2:{i:0;s:5:"_csrf";i:1;s:32:"OAt5QWku9QCUlMhcttPCc7DJIjOKPBQo";}',
];

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