PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791482846',
];

$_COOKIE = [
    '_csrf' => '894717e1c47660ff910d825b8047807df021669c6124c30005813c0a33af39afa:2:{i:0;s:5:"_csrf";i:1;s:32:"PNGxOEYRcZb5blzkuXsaOlf0V7Nw5S14";}',
    'PHPSESSID' => '97v1tde5b647h3m5t57fls4hb7',
    'topics-session' => '1791489192.672.16974.889038|d197bbbd1d400bd72372bc93068ad169',
];

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