Problems using DataSetGraph.deleteAny

[Timo Westkämper]

Hi.

I am having issues with the following code
        DataSource dataSource = DataSourceImpl.createMem();
        Node subject = Node.createURI(TEST.NS);
        Node predicate = Node.createURI(RDFS.label.getId());
        Node object = Node.createAnon();
        dataSource.asDatasetGraph().add(new Quad(Quad.defaultGraphIRI, 
subject, predicate, object));
        dataSource.asDatasetGraph().deleteAny(null, subject, null, null);

The last line throws the following Exception :

java.lang.NullPointerException
    at com.hp.hpl.jena.sparql.core.Quad.isDefaultGraph(Quad.java:87)
    at 
com.hp.hpl.jena.sparql.core.DatasetGraphCollection.fetchGraph(DatasetGraphCollection.java:75)
    at 
com.hp.hpl.jena.sparql.core.DatasetGraphCollection.delete(DatasetGraphCollection.java:33)
    at 
com.hp.hpl.jena.sparql.core.DatasetGraphBase.deleteAny(DatasetGraphBase.java:79)

Am I using the API wrong?

Br,
Timo Westkämper