java.lang.NullPointerException: Null child at index 0, parent: Root, model: org.netbeans.spi.viewmodel.Models$CompoundModel@434bb370
  TreeModel = org.netbeans.spi.viewmodel.Models$CompoundTreeModel@59ac9e80
    org.netbeans.modules.debugger.jpda.projects.ToolTipTreeModelFilter@1461f52d
      org.netbeans.modules.debugger.jpda.ui.models.VariablesTreeModelFilter@7bdbb584
        org.netbeans.modules.debugger.jpda.ui.models.VariablesTreeModelFilterSI@6d988c50
          org.netbeans.spi.viewmodel.Models$DelegatingTreeModel@1ef1a094
    org.netbeans.modules.debugger.jpda.models.LocalsTreeModel@4cc6376a
  NodeModel = org.netbeans.spi.viewmodel.Models$CompoundNodeModel@1235e034
    org.netbeans.modules.debugger.jpda.projects.ToolTipNodeModelFilter@28105d2b
      org.netbeans.modules.debugger.jpda.ui.models.VariablesTreeModelFilter@7bdbb584
        org.netbeans.modules.debugger.jpda.ui.models.VariablesNodeModel@678b3c06
        org.netbeans.modules.debugger.jpda.ui.models.VariablesTreeModelFilterSI@6d988c50
  TableM
   at org.netbeans.modules.viewmodel.TreeModelNode$TreeModelChildren.applyChildren(TreeModelNode.java:1377)
   at org.netbeans.modules.viewmodel.TreeModelNode$TreeModelChildren.refreshLazyChildren(TreeModelNode.java:1353)
   at org.netbeans.modules.viewmodel.TreeModelNode$TreeModelChildren.refreshChildren(TreeModelNode.java:1213)
   at org.netbeans.modules.viewmodel.TreeModelNode.refreshTheChildren(TreeModelNode.java:820)
   at org.netbeans.modules.viewmodel.TreeModelNode.refreshTheChildren(TreeModelNode.java:803)
   at org.netbeans.modules.viewmodel.TreeModelNode$5.run(TreeModelNode.java:546)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:199)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:134)
   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)
Caused: java.lang.reflect.InvocationTargetException
   at java.awt.EventQueue.invokeAndWait(EventQueue.java:998)
   at javax.swing.SwingUtilities.invokeAndWait(SwingUtilities.java:1320)
   at org.netbeans.modules.viewmodel.TreeModelNode$5.run(TreeModelNode.java:529)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1415)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1954)