PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791597213',
];

$_COOKIE = [
    'topics-session' => '1791677038.178.16481.715352|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'osrhvfd8q9ceteanibtl4kqpb5',
    '_csrf' => '2e025922d0326e358a864eb28ba831a9bfbf95ee8a680a5aff1c73b7ce9bd686a:2:{i:0;s:5:"_csrf";i:1;s:32:"uTXISwWDZVwDOqysOVgzDrxmrLhzPf18";}',
];

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