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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 org.protege.editor.owl.ui.metrics.MetricsPanel$3.getTableCellRendererComponent(MetricsPanel.java:155)	at javax.swing.JTable.prepareRenderer(JTable.java:5723)	at javax.swing.plaf.basic.BasicTableUI.paintCell(BasicTableUI.java:2114)	at javax.swing.plaf.basic.BasicTableUI.paintCells(BasicTableUI.java:2016)