java.lang.NullPointerException: null

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java.lang.NullPointerException: null
at org.protege.editor.owl.model.inference.NoOpReasoner.getBottomObjectPropertyNode(NoOpReasoner.java:195)
at org.protege.editor.owl.ui.renderer.OWLCellRenderer.lambda$highlightPropertyIfUnsatisfiable$18(OWLCellRenderer.java:913)
at org.protege.editor.owl.model.inference.DisplayedInferencePreferences.executeTask(DisplayedInferencePreferences.java:118)
at org.protege.editor.owl.model.inference.ReasonerPreferences.executeTask(ReasonerPreferences.java:182)
at org.protege.editor.owl.ui.renderer.OWLCellRenderer.highlightPropertyIfUnsatisfiable(OWLCellRenderer.java:908)
at org.protege.editor.owl.ui.renderer.OWLCellRenderer.renderToken(OWLCellRenderer.java:807)
at org.protege.editor.owl.ui.renderer.OWLCellRenderer.highlightText(OWLCellRenderer.java:743)
at org.protege.editor.owl.ui.renderer.OWLCellRenderer.prepareTextPane(OWLCellRenderer.java:715)
at org.protege.editor.owl.ui.renderer.OWLCellRenderer.prepareRenderer(OWLCellRenderer.java:483)
at org.protege.editor.owl.ui.renderer.OWLCellRenderer.getTreeCellRendererComponent(OWLCellRenderer.java:369)

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