NullPointerException when using a null query

Exception in thread "main" java.lang.NullPointerException
at org.hippoecm.repository.impl.QueryDecorator.mangleArguments(QueryDecorator.java:177)
at org.hippoecm.repository.impl.QueryManagerDecorator.createQuery(QueryManagerDecorator.java:40)
at org.hippoecm.repository.decorating.checked.QueryManagerDecorator.createQuery(QueryManagerDecorator.java:49)
at org.apache.jackrabbit.rmi.server.ServerQueryManager.createQuery(ServerQueryManager.java:71)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:305)
at sun.rmi.transport.Transport$1.run(Transport.java:159)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:155)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
...