PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791233775',
];

$_COOKIE = [
    'topics-session' => '1791254173.053.16481.951377|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'rk3k7qasm5jb9kf1rggtjf5eg2',
    '_csrf' => 'b2b5cafccd2dcc4ab36696b0ec4c3169ea6a95580d324d5b6846e800b1b43a0da:2:{i:0;s:5:"_csrf";i:1;s:32:"5I7Y3Ox0u2ruVzJ5jFrcfo3LVPkNB9Qn";}',
];

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