PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791359342',
];

$_COOKIE = [
    'PHPSESSID' => 'kgpp5gi937gsthgfsb08m71uc4',
    '_csrf' => '90cba749684b29423c15ff6823ced2f95946fd81703e9552e206a53097109346a:2:{i:0;s:5:"_csrf";i:1;s:32:"4PVJ8A34SI0cJ7Yg2aL0YLKHe25pPLbo";}',
    'topics-session' => '1791466410.711.16482.747819|d197bbbd1d400bd72372bc93068ad169',
];

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