PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791267418',
];

$_COOKIE = [
    '_csrf' => '0a0a976e08e840ccb69c20f6aeb7e8f033498c4df2f1fe6f416c34a8c6a3ca97a:2:{i:0;s:5:"_csrf";i:1;s:32:"jtIODaxivtHCXlaGVwumcw42qeH-oQJP";}',
    'topics-session' => '1791392785.36.16958.708551|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => '41l21ckc3rbj1rmuh2qllmtin0',
];

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