PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1790858542',
];

$_COOKIE = [
    'topics-session' => '1790881467.836.17008.358293|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'bjdekkjc963p7di8knm387c1n3',
    '_csrf' => '0251808ceee64007e5cfdb0348ab3fe0022761fc2b7392e92fb7e39e42cf259ca:2:{i:0;s:5:"_csrf";i:1;s:32:"Tkm9xlaAJQD8DX3eMu-uRKoTSxF71nhD";}',
];

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