PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1790935444',
];

$_COOKIE = [
    'topics-session' => '1791392665.232.16481.911561|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'qdnmf95ua765aqf1r7qar3i2u2',
    '_csrf' => 'd363a39b43012e27384ebe5a5126e2f1a46fb9028c03b717b33bd863cc04cb33a:2:{i:0;s:5:"_csrf";i:1;s:32:"Edmc88iiPj8EcUYqQKKtgHap0Dwzntan";}',
];

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