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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$18(OWLCellRenderer.java:913)	at org.protege.editor.owl.model.inference.DisplayedInferencePreferences.executeTask(DisplayedInferencePreferences.java:118)	at org.protege.editor.owl.model.inference.ReasonerPreferences.executeTask(ReasonerPreferences.java:182)	at org.protege.editor.owl.ui.renderer.OWLCellRenderer.highlightPropertyIfUnsatisfiable(OWLCellRenderer.java:908)	at org.protege.editor.owl.ui.renderer.OWLCellRenderer.renderToken(OWLCellRenderer.java:807)	at org.protege.editor.owl.ui.renderer.OWLCellRenderer.highlightText(OWLCellRenderer.java:743)	at org.protege.editor.owl.ui.renderer.OWLCellRenderer.prepareTextPane(OWLCellRenderer.java:715)	at org.protege.editor.owl.ui.renderer.OWLCellRenderer.prepareRenderer(OWLCellRenderer.java:483)	at org.protege.editor.owl.ui.renderer.OWLCellRenderer.getTreeCellRendererComponent(OWLCellRenderer.java:369)	at org.protege.editor.owl.ui.tree.OWLObjectTreeCellRenderer.getTreeCellRendererComponent(OWLObjectTreeCellRenderer.java:34)	at javax.swing.plaf.basic.BasicTreeUI$NodeDimensionsHandler.getNodeDimensions(BasicTreeUI.java:2807)