Order modification: can't add new product

[pcmilhouse]

With VM 3.0.9 I can't add a new item in order modification.

I've this error in javascript console:
index.php?option=com_virtuemart&view=orders&task=edit&virtuemart_order_id=1012:1858 Uncaught TypeError: row.contains is not a functionaddNewLine @ index.php?option=com_virtuemart&view=orders&task=edit&virtuemart_order_id=1012:1858onclick @ index.php?option=com_virtuemart&view=orders&task=edit&virtuemart_order_id=1012:1597

Is this a bug? Or some misconfiguration?

Regards