java.lang.IllegalStateException: Incoming event already cleared
   at org.netbeans.modules.editor.lib2.view.ViewUpdates.clearIncomingEvent(ViewUpdates.java:548)
   at org.netbeans.modules.editor.lib2.view.ViewUpdates.changedUpdate(ViewUpdates.java:301)
   at jdk.internal.reflect.GeneratedMethodAccessor114.invoke(GeneratedMethodAccessor114.java:0)
   at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:563)
   at org.openide.util.WeakListenerImpl$ProxyListener.invoke(WeakListenerImpl.java:487)
   at com.sun.proxy.$Proxy24.changedUpdate(.java:0)
   at org.netbeans.lib.editor.util.swing.PriorityDocumentListenerList.changedUpdate(PriorityDocumentListenerList.java:147)
   at javax.swing.text.AbstractDocument.fireChangedUpdate(AbstractDocument.java:232)
   at org.netbeans.editor.BaseDocument.fireChangedUpdate(BaseDocument.java:1669)
   at org.netbeans.editor.GuardedDocument.setCharacterAttributes(GuardedDocument.java:427)
   at org.netbeans.modules.editor.NbEditorDocument.setCharacterAttributes(NbEditorDocument.java:177)
   at org.openide.text.NbDocument.unmarkGuarded(NbDocument.java:258)
   at org.netbeans.modules.editor.impl.NbGuardedMarker.unprotectRegion(NbGuardedMarker.java:74)
   at org.netbeans.modules.editor.guards.GuardedSectionImpl.markGuarded(GuardedSectionImpl.java:223)
   at org.netbeans.modules.editor.guards.SimpleSectionImpl.unmarkGuarded(SimpleSectionImpl.java:99)
   at org.netbeans.modules.editor.guards.GuardedSectionImpl.removeSection(GuardedSectionImpl.java:154)
   at org.netbeans.api.editor.guards.GuardedSection.removeSection(GuardedSection.java:121)
   at org.netbeans.modules.jshell.support.ShellSession.lambda$refreshGuardedSection$139(ShellSession.java:1493)
   at java.lang.Iterable.forEach(Iterable.java:78)
   at org.netbeans.modules.jshell.support.ShellSession.refreshGuardedSection(ShellSession.java:1493)
   at org.netbeans.modules.jshell.support.ShellSession.access$2900(ShellSession.java:171)
   at org.netbeans.modules.jshell.support.ShellSession$GuardedSectionUpdater.refresh(ShellSession.java:1530)
   at org.netbeans.modules.jshell.support.ShellSession$GuardedSectionUpdater.sectionUpdated(ShellSession.java:1540)
   at org.netbeans.modules.jshell.model.ConsoleModel.lambda$notifyUpdated$143(ConsoleModel.java:570)
   at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1492)
   at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:591)
   at org.netbeans.modules.jshell.model.ConsoleModel.notifyUpdated(ConsoleModel.java:570)
   at org.netbeans.modules.jshell.model.ConsoleModel.access$2200(ConsoleModel.java:106)
   at org.netbeans.modules.jshell.model.ConsoleModel$EventBuffer.lambda$runUpdate$146(ConsoleModel.java:640)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.IllegalStateException: Incoming event already cleared
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:420)
   at org.netbeans.modules.jshell.model.ConsoleModel$EventBuffer.runUpdate(ConsoleModel.java:638)
   at org.netbeans.modules.jshell.model.ConsoleModel$InputReader.propagateResults(ConsoleModel.java:481)
   at org.netbeans.modules.jshell.model.ConsoleModel$InputReader.run(ConsoleModel.java:411)
   at org.netbeans.editor.BaseDocument.render(BaseDocument.java:1427)
   at org.netbeans.modules.jshell.model.ConsoleModel$InputReader.doIt(ConsoleModel.java:431)
   at org.netbeans.modules.jshell.model.ConsoleModel$InputReader.run(ConsoleModel.java:404)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)