PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791155965',
];

$_COOKIE = [
    'topics-session' => '1791312518.042.16480.239990|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => '20aa0ku4gt3dv11f734l8bj542',
    '_csrf' => 'e8d33e9c9212747b14f29045bf9410b61a2076d3d02693439e81507463b7506da:2:{i:0;s:5:"_csrf";i:1;s:32:"acdMHHYYFFrH9OcuobEJoxsbHSjLzcOK";}',
];

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