PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791577073',
];

$_COOKIE = [
    'topics-session' => '1791811109.102.16974.56667|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'h28latj69fm25ppfl8kl82dba5',
    '_csrf' => '7c25fa6dfdd48616a25936feab036b0c2a82ef77b1045c53a206f4ddc946b857a:2:{i:0;s:5:"_csrf";i:1;s:32:"e-iQRVeVgB_b8SHi1qSjLg3x7xmiDviZ";}',
];

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