PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791020232',
];

$_COOKIE = [
    'topics-session' => '1791147146.386.16477.52583|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => '0ru5dmr9f1utlmpkvkb3og3n41',
    '_csrf' => '672ffd5c6c9594d45bd9435ae156097637170ca65db03678f76a11e707cacf9ca:2:{i:0;s:5:"_csrf";i:1;s:32:"JDd5MhIh3PyQPliKiFBfLJxmo27OMrUR";}',
];

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