java.lang.NullPointerException: Null child at index 0, parent: Root, model: org.netbeans.spi.viewmodel.Models$CompoundModel@17fde781
  TreeModel = org.netbeans.spi.viewmodel.Models$CompoundTreeModel@4e7a84f7
    org.netbeans.modules.debugger.jpda.projects.ToolTipTreeModelFilter@583eceb8
      org.netbeans.modules.debugger.jpda.ui.models.VariablesTreeModelFilter@254ef3d9
        org.netbeans.modules.debugger.jpda.ui.models.VariablesTreeModelFilterSI@626b3eb1
          org.netbeans.spi.viewmodel.Models$DelegatingTreeModel@1e69d275
    org.netbeans.modules.debugger.jpda.models.LocalsTreeModel@754dfe86
  NodeModel = org.netbeans.spi.viewmodel.Models$CompoundNodeModel@4443cc1f
    org.netbeans.modules.debugger.jpda.projects.ToolTipNodeModelFilter@375bf4b
      org.netbeans.modules.debugger.jpda.ui.models.VariablesTreeModelFilter@254ef3d9
        org.netbeans.modules.debugger.jpda.ui.models.VariablesNodeModel@139e703d
        org.netbeans.modules.debugger.jpda.ui.models.VariablesTreeModelFilterSI@626b3eb1
  TableMo
   at org.netbeans.modules.viewmodel.TreeModelNode$TreeModelChildren.applyChildren(TreeModelNode.java:1380)
   at org.netbeans.modules.viewmodel.TreeModelNode$TreeModelChildren.refreshLazyChildren(TreeModelNode.java:1356)
   at org.netbeans.modules.viewmodel.TreeModelNode$TreeModelChildren.refreshChildren(TreeModelNode.java:1216)
   at org.netbeans.modules.viewmodel.TreeModelNode.refreshTheChildren(TreeModelNode.java:823)
   at org.netbeans.modules.viewmodel.TreeModelNode.refreshTheChildren(TreeModelNode.java:806)
   at org.netbeans.modules.viewmodel.TreeModelNode$5.run(TreeModelNode.java:549)
   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:137)
   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$5.run(TreeModelNode.java:532)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1957)