Cannot modify readonly property DOMElement::$tagName

[jviure]

This part of InvoiceSubmission.php (line 506-514)

// IDFactura (required)
if (method_exists($this, 'getInvoiceId')) {
$invoiceId = $this->getInvoiceId();
if (method_exists($invoiceId, 'toXml')) {
$idFacturaNode = $invoiceId->toXml($doc);
$idFacturaNode->tagName = 'IDFactura';
$root->appendChild($idFacturaNode);
}
}

is giving this error:

Cannot modify readonly property DOMElement::$tagName

Stack frames (49)
48
Error
…/vendor/eseperio/verifactu-php/src/models/InvoiceSubmission.php 511

Is this a known bug? thanks!