PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791184061',
];

$_COOKIE = [
    'topics-session' => '1791248919.633.16697.559808|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'kc2u5kefmfb0cm9mp0j5751130',
    '_csrf' => '159b6448455257ed65a3c7ce5704a5ad2ea5608d94d3307911bc7fcc5704274aa:2:{i:0;s:5:"_csrf";i:1;s:32:"s3wgiy7039w_eArMO-VDGiqo0O3AHcvo";}',
];

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