PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791027487',
];

$_COOKIE = [
    '_csrf' => '77bc156361817d63044b869c42f2d1f9f1e993693d6899be3785b37cae70aedaa:2:{i:0;s:5:"_csrf";i:1;s:32:"YoWPSGOJPkS_LhCZKn5WEXiSQOoxRe7T";}',
    'topics-session' => '1791106651.146.16511.532582|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'ltd7fohjvl0ce0sl1bqcpq4ce7',
];

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