java.lang.NullPointerException: null

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java.lang.NullPointerException: null
at uk.ac.manchester.cs.owl.owlapi.OWLImmutableOntologyImpl.getImportsClosure(OWLImmutableOntologyImpl.java:842)
at uk.ac.manchester.cs.owl.owlapi.concurrent.ConcurrentOWLOntologyImpl.getImportsClosure(ConcurrentOWLOntologyImpl.java:190)
at org.semanticweb.owlapi.metrics.AbstractOWLMetric.getOntologies(AbstractOWLMetric.java:99)
at org.semanticweb.owlapi.metrics.AxiomCount.recomputeMetric(AxiomCount.java:42)
at org.semanticweb.owlapi.metrics.AxiomCount.recomputeMetric(AxiomCount.java:27)
at org.semanticweb.owlapi.metrics.AbstractOWLMetric.getValue(AbstractOWLMetric.java:82)
at org.semanticweb.owlapi.metrics.AbstractOWLMetric.getValue(AbstractOWLMetric.java:36)
at org.protege.editor.owl.ui.metrics.MetricsTableModel.getValueAt(MetricsTableModel.java:46)
at javax.swing.JTable.prepareRenderer(JTable.java:5723)
at javax.swing.plaf.basic.BasicTableUI.paintCell(BasicTableUI.java:2114)

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