java.lang.NullPointerException
   at org.netbeans.modules.editor.lib2.view.EditorBoxView.getViewIndexFirst(EditorBoxView.java:381)
   at org.netbeans.modules.editor.lib2.view.ViewUpdates.removeUpdate(ViewUpdates.java:311)
   at org.netbeans.lib.editor.util.swing.PriorityDocumentListenerList.removeUpdate(PriorityDocumentListenerList.java:99)
   at javax.swing.text.AbstractDocument.fireRemoveUpdate(AbstractDocument.java:243)
   at org.netbeans.editor.BaseDocument.fireRemoveUpdate(BaseDocument.java:1634)
   at org.netbeans.editor.BaseDocument.remove(BaseDocument.java:933)
   at org.netbeans.modules.diff.builtin.visualizer.editable.EditableDiffView$TextualDiffRefreshTask$2.run(EditableDiffView.java:1215)
   at org.netbeans.editor.GuardedDocument.runAtomic(GuardedDocument.java:311)
   at org.openide.text.NbDocument.runAtomic(NbDocument.java:419)
   at org.netbeans.modules.diff.builtin.visualizer.editable.EditableDiffView$TextualDiffRefreshTask.exportDiff(EditableDiffView.java:1210)
   at org.netbeans.modules.diff.builtin.visualizer.editable.EditableDiffView$TextualDiffRefreshTask.refresh(EditableDiffView.java:1124)
   at org.netbeans.modules.diff.builtin.visualizer.editable.EditableDiffView$RefreshDiffTask.run(EditableDiffView.java:1301)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NullPointerException
   at org.openide.util.RequestProcessor$Task.schedule(RequestProcessor.java:1407)
   at org.netbeans.modules.diff.builtin.visualizer.editable.EditableDiffView.refreshDiff(EditableDiffView.java:1292)
   at org.netbeans.modules.diff.builtin.visualizer.editable.EditableDiffView.<init>(EditableDiffView.java:319)
   at org.netbeans.modules.diff.builtin.DefaultDiffControllerProvider.createEnhancedDiffController(DefaultDiffControllerProvider.java:64)
   at org.netbeans.api.diff.DiffController.createEnhanced(DiffController.java:109)
   at org.netbeans.modules.subversion.ui.diff.MultiDiffPanel$DiffPrepareTask.run(MultiDiffPanel.java:925)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1369)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1907)