SOAP builder fails for messages with empty elemt

If there is empty elements in the SOAP message, the builder fails to extract SOAP body

Here is the message for which it fails:
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:wsa="http://www.w3.org/2005/08/addressing"><soapenv:Header><ReplyTo customer:level="premium" xmlns="http://www.w3.org/2005/08/addressing" xmlns:customer="http://example.org/customer"><wsa:Address xmlns:wsa="http://www.w3.org/2005/08/addressing">http://www.w3.org/2005/08/addressing/none</wsa:Address><wsa:ReferenceParameters customer:level="premium" xmlns:wsa="http://www.w3.org/2005/08/addressing"><customer:CustomerKey xmlns:customer="http://example.org/customer">Key#123456789</customer:CustomerKey></wsa:ReferenceParameters><wsa:Metadata customer:total="1" xmlns:customer="http://example.org/customer" xmlns:wsa="http://www.w3.org/2005/08/addressing"/><customer:Metadata xmlns:customer="http://example.org/customer"><customer:extraStuff>This should be ignored.</customer:extraStuff></customer:Metadata></ReplyTo><wsa:To xmlns:wsa="http://www.w3.org/2005/08/addressing">http://222.165.178.239:9090/axis2/services/wsa_test_svc</wsa:To><wsa:Action xmlns:wsa="http://www.w3.org/2005/08/addressing">http://example.org/action/notify</wsa:Action><wsa:MessageID xmlns:wsa="http://www.w3.org/2005/08/addressing">uuid:A1861687-010A-4000-E000-0D94C0A8005E</wsa:MessageID></soapenv:Header><soapenv:Body><m:notify xmlns:m="http://example.org/notify">test1108</m:notify></soapenv:Body></soapenv:Envelope>

If I remove the tag "<wsa:Metadata customer:total="1" xmlns:customer="http://example.org/customer" xmlns:wsa="http://www.w3.org/2005/08/addressing"/>" it works