PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791658693',
];

$_COOKIE = [
    'PHPSESSID' => 'h4qj87bm3q9cnahvp7j9blo1l3',
    'topics-session' => '1792039389.913.16477.543212|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => 'e6322d0902c2a839cec73440582a750a758fa2dd146a1d54d028e85769aed30da:2:{i:0;s:5:"_csrf";i:1;s:32:"47pc8TwFER8RwQhvYBJsrV7WxiBoN-B0";}',
];

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