java.lang.IndexOutOfBoundsException: toIndex = 20
   at java.util.ArrayList.subListRangeCheck(ArrayList.java:1004)
   at java.util.ArrayList.subList(ArrayList.java:996)
   at org.netbeans.modules.web.javascript.debugger.locals.VariablesModel.getChildren(VariablesModel.java:136)
   at org.netbeans.spi.viewmodel.Models$DelegatingTreeModel.getChildren(Models.java:1795)
   at org.netbeans.spi.viewmodel.Models$CompoundModel.getChildren(Models.java:4422)
   at org.netbeans.modules.debugger.ui.views.ViewModelListener$5.getChildren(ViewModelListener.java:462)
   at org.netbeans.modules.viewmodel.TreeModelHyperNode$HyperModelChildren.getModelChildren(TreeModelHyperNode.java:241)
   at org.netbeans.modules.viewmodel.TreeModelNode$TreeModelChildren.run(TreeModelNode.java:1446)
   at org.openide.util.RequestProcessor$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)