Rest with empty Parameter ends in a Segmentation Fault

If I execute the following query:

let $parameters :=
  <zorba-rest:payload>
    <zorba-rest:part name="parameter"></zorba-rest:part>
  </zorba-rest:payload>
return zorba-rest:get("http://www.google.com", $parameters)

... I get a segmentation fault in runtime/rest/rest.cpp line 641. The variable 'child' in the condition 'if (child->getNodeKind() == store::StoreConsts::textNode)' contains the null pointer.