PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791831701',
];

$_COOKIE = [
    'PHPSESSID' => 's4ptl4tdsrvo9onucp3u0143n0',
    '_csrf' => 'ceca9b58538dff9dcd892a386e8493fdc2e17ba77b38496434ee2f360867e270a:2:{i:0;s:5:"_csrf";i:1;s:32:"lARttkeJbczKx9bNwqkCZHC9h41muvd7";}',
    'topics-session' => '1791938926.091.16480.927537|d197bbbd1d400bd72372bc93068ad169',
];

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