PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791403344',
];

$_COOKIE = [
    'topics-session' => '1791440615.705.16615.413166|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'cuocucbgnsacr9kaskood4vga5',
    '_csrf' => 'f020066ff164bc3c6cf35fa12c88b3dfa647560b5273c4125f7956927aa52e3da:2:{i:0;s:5:"_csrf";i:1;s:32:"ZTtej1qNi7zMXeNju2ThD0ua_wKHH36V";}',
];

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