PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791788047',
];

$_COOKIE = [
    'PHPSESSID' => 'sna1tk1s8d1mlsfkmmh8ed8p40',
    'topics-session' => '1791995721.963.16940.320200|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => 'da7ef126ac5cac1860de3ee07c92f0c8e2d01d74f3a59b04295af0045d94c6bba:2:{i:0;s:5:"_csrf";i:1;s:32:"fmFBwQ0h541CCitaXeItFKGz0U940RI0";}',
];

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