java.lang.NullPointerException: Null child at index 8, parent: swingListeners, model: org.netbeans.spi.viewmodel.Models$CompoundModel@281b48b4
  TreeModel = org.netbeans.spi.viewmodel.Models$DelegatingTreeModel@66b378c2
    org.netbeans.modules.debugger.jpda.visual.models.EventsModel@222f2421
  NodeModel =     org.netbeans.modules.debugger.jpda.visual.models.EventsModel@222f2421
  TableModel = org.netbeans.spi.viewmodel.Models$DelegatingTableModel@4a55ac8e

  NodeActionsProvider = org.netbeans.spi.viewmodel.Models$DelegatingNodeActionsProvider@10bd3d3b
    org.netbeans.modules.debugger.jpda.visual.models.EventsModel@222f2421
  ColumnsModel = [org.netbeans.modules.debugger.ui.registry.ColumnModelContextAware@44ed040f]
   at org.netbeans.modules.viewmodel.TreeModelNode$TreeModelChildren.applyChildren(TreeModelNode.java:1418)
   at org.netbeans.modules.viewmodel.TreeModelNode$TreeModelChildren.run(TreeModelNode.java:1302)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1424)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1973)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NullPointerException: Null child at index 8, parent: swingListeners, model: org.netbeans.spi.viewmodel.Models$CompoundModel@281b48b4
  TreeModel = org.netbeans.spi.viewmodel.Models$DelegatingTreeModel@66b378c2
    org.netbeans.modules.debugger.jpda.visual.models.EventsModel@222f2421
  NodeModel =     org.netbeans.modules.debugger.jpda.visual.models.EventsModel@222f2421
  TableModel = org.netbeans.spi.viewmodel.Models$DelegatingTableModel@4a55ac8e

  NodeActionsProvider = org.netbeans.spi.viewmodel.Models$DelegatingNodeActionsProvider@10bd3d3b
    org.netbeans.modules.debugger.jpda.visual.models.EventsModel@222f2421
  ColumnsModel = [org.netbeans.modules.debugger.ui.registry.ColumnModelContextAware@44ed040f]
   at org.openide.util.RequestProcessor.execute(RequestProcessor.java:415)
   at org.netbeans.modules.viewmodel.TreeModelNode$TreeModelChildren.refreshLazyChildren(TreeModelNode.java:1362)
   at org.netbeans.modules.viewmodel.TreeModelNode$TreeModelChildren.refreshChildren(TreeModelNode.java:1250)
   at org.netbeans.modules.viewmodel.TreeModelNode$TreeModelChildren.addNotify(TreeModelNode.java:1238)
   at org.openide.nodes.Children.callAddNotify(Children.java:568)
   at org.openide.nodes.EntrySupport$Default.getArray(EntrySupport.java:770)
   at org.openide.nodes.EntrySupport$Default.getNodes(EntrySupport.java:172)
   at org.openide.nodes.EntrySupport$Default.getNodes(EntrySupport.java:228)
   at org.openide.nodes.Children.getNodes(Children.java:462)
   at org.netbeans.modules.viewmodel.TreeModelNode$TreeModelChildren.destroyNodes(TreeModelNode.java:1527)
   at org.openide.nodes.EntrySupport$Default.notifyRemove(EntrySupport.java:692)
   at org.openide.nodes.EntrySupport$Default.updateRemove(EntrySupport.java:407)
   at org.openide.nodes.EntrySupport$Default.setEntries(EntrySupport.java:357)
   at org.openide.nodes.EntrySupport.setEntries(EntrySupport.java:102)
   at org.openide.nodes.Children$Keys$2.run(Children.java:1548)
   at org.openide.util.Mutex$1Exec.run(Mutex.java:1244)
   at org.openide.nodes.Children$ProjectManagerDeadlockDetector.execute(Children.java:1913)
   at org.openide.util.Mutex.postRequest(Mutex.java:1250)
   at org.openide.util.Mutex.postRequest(Mutex.java:1213)
   at org.openide.util.Mutex.postWriteRequest(Mutex.java:585)
   at org.openide.nodes.Children$Keys.applyKeys(Children.java:1557)
   at org.openide.nodes.Children$Keys.setKeys(Children.java:1538)
   at org.netbeans.modules.viewmodel.TreeModelNode$TreeModelChildren.applyWaitChildren(TreeModelNode.java:1478)
   at org.netbeans.modules.viewmodel.TreeModelNode$TreeModelChildren.refreshLazyChildren(TreeModelNode.java:1393)
   at org.netbeans.modules.viewmodel.TreeModelNode$TreeModelChildren.refreshChildren(TreeModelNode.java:1250)
   at org.netbeans.modules.viewmodel.TreeModelNode.refreshTheChildren(TreeModelNode.java:857)
   at org.netbeans.modules.viewmodel.TreeModelNode.refreshTheChildren(TreeModelNode.java:840)
   at org.netbeans.modules.viewmodel.TreeModelNode$5.run(TreeModelNode.java:587)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:199)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:642)
   at java.awt.EventQueue.access$000(EventQueue.java:85)
   at java.awt.EventQueue$1.run(EventQueue.java:603)
   at java.awt.EventQueue$1.run(EventQueue.java:601)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:612)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:153)
   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)