java.lang.AssertionError: Empty highlight at offset=276
   at org.netbeans.modules.editor.lib2.view.HighlightsViewFactory.fetchNextHighlight(HighlightsViewFactory.java:183)
   at org.netbeans.modules.editor.lib2.view.HighlightsViewFactory.updateHighlight(HighlightsViewFactory.java:162)
   at org.netbeans.modules.editor.lib2.view.HighlightsViewFactory.createView(HighlightsViewFactory.java:127)
   at org.netbeans.modules.editor.lib2.view.ViewBuilder.createNextView(ViewBuilder.java:261)
   at org.netbeans.modules.editor.lib2.view.ViewBuilder.createViews(ViewBuilder.java:215)
   at org.netbeans.modules.editor.lib2.view.ViewUpdates.removeUpdate(ViewUpdates.java:332)
   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.javafx.editor.format.JFXReformatTask.reformatImpl(JFXReformatTask.java:321)
   at org.netbeans.modules.javafx.editor.format.JFXReformatTask.reformat(JFXReformatTask.java:116)
   at org.netbeans.modules.editor.indent.TaskHandler$MimeItem.runTask(TaskHandler.java:547)
   at org.netbeans.modules.editor.indent.TaskHandler.runTasks(TaskHandler.java:314)
   at org.netbeans.modules.editor.indent.IndentImpl.reformat(IndentImpl.java:317)
   at org.netbeans.modules.editor.indent.FormatterImpl.reformat(FormatterImpl.java:187)
   at org.netbeans.editor.ActionFactory$FormatAction$1$1.run(ActionFactory.java:1680)
   at org.netbeans.editor.GuardedDocument.runAtomicAsUser(GuardedDocument.java:341)
   at org.netbeans.editor.ActionFactory$FormatAction$1.run(ActionFactory.java:1648)
   at org.netbeans.modules.progress.ui.RunOffEDTImpl$1.run(RunOffEDTImpl.java:156)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1367)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1905)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.AssertionError: Empty highlight at offset=276
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:366)
   at org.netbeans.modules.progress.ui.RunOffEDTImpl.runOffEventDispatchThreadImpl(RunOffEDTImpl.java:150)
   at org.netbeans.modules.progress.ui.RunOffEDTImpl.runOffEventDispatchThread(RunOffEDTImpl.java:112)
   at org.netbeans.api.progress.ProgressUtils.runOffEventDispatchThread(ProgressUtils.java:86)
   at org.netbeans.editor.ActionFactory$FormatAction.actionPerformed(ActionFactory.java:1640)
   at org.netbeans.editor.BaseAction.actionPerformed(BaseAction.java:336)
   at org.openide.awt.AlwaysEnabledAction$1.run(AlwaysEnabledAction.java:137)
   at org.openide.util.actions.ActionInvoker$1.run(ActionInvoker.java:92)
   at org.openide.util.actions.ActionInvoker.doPerformAction(ActionInvoker.java:113)
   at org.openide.util.actions.ActionInvoker.invokeAction(ActionInvoker.java:96)
   at org.openide.awt.AlwaysEnabledAction.actionPerformed(AlwaysEnabledAction.java:140)
   at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1636)
   at javax.swing.JComponent.processKeyBinding(JComponent.java:2851)
   at javax.swing.JComponent.processKeyBindings(JComponent.java:2886)
   at javax.swing.JComponent.processKeyEvent(JComponent.java:2814)
   at java.awt.Component.processEvent(Component.java:6040)
   at java.awt.Container.processEvent(Container.java:2041)
   at java.awt.Component.dispatchEventImpl(Component.java:4630)
   at java.awt.Container.dispatchEventImpl(Container.java:2099)
   at java.awt.Component.dispatchEvent(Component.java:4460)
   at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1848)
   at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:704)
   at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:969)
   at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:841)
   at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:668)
   at java.awt.Component.dispatchEventImpl(Component.java:4502)
   at java.awt.Container.dispatchEventImpl(Container.java:2099)
   at java.awt.Window.dispatchEventImpl(Window.java:2475)
   at java.awt.Component.dispatchEvent(Component.java:4460)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:133)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)