PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791270773',
];

$_COOKIE = [
    'topics-session' => '1791479720.723.16855.797295|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => '9m0nq2u3sre5ftgb1nu5aj60p1',
    '_csrf' => '9073c947fdb06ba4c35c7624f348326a16a258d5ad42941fa5e49a8310f5ff92a:2:{i:0;s:5:"_csrf";i:1;s:32:"MDhKy6MzENdT0GfTSIl2ZRcg0VLIMh3h";}',
];

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