PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791411297',
];

$_COOKIE = [
    'topics-session' => '1791436734.709.16697.496117|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => '597a9795648d6ed038bf1d51c064cb48c476f02e7073c8b0ed9a377f07a5ffb3a:2:{i:0;s:5:"_csrf";i:1;s:32:"5vuesNzzmBUothHxjnSYvPFVGdi8lH3t";}',
    'PHPSESSID' => 'lu9kk6jk5tcp1hjmefdsa0bq22',
];

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