PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791514910',
];

$_COOKIE = [
    'PHPSESSID' => '4719l5uv8tenvdeblivtvgd026',
    '_csrf' => '9e9eba19d2438f568fa3c5147c9dd59ba7720e69a82402153abc70fc9043b63ba:2:{i:0;s:5:"_csrf";i:1;s:32:"zroTaSAKOSx8Sld6QUPbga79F961WAq1";}',
    'topics-session' => '1791581284.955.16940.997183|d197bbbd1d400bd72372bc93068ad169',
];

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