PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791652853',
];

$_COOKIE = [
    'topics-session' => '1791740849.044.16475.275804|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => '6178861076b56ba3cff23144fc7499058bc46d9729a521f61741f4619db937aea:2:{i:0;s:5:"_csrf";i:1;s:32:"zq9BiceZYHu_UcyD7Q7oiOZQdU6cgRmk";}',
];

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