java.lang.NullPointerException
        at org.netbeans.modules.debugger.jpda.models.LocalsTreeModel.getChildrenImpl(LocalsTreeModel.java:209)
        at org.netbeans.modules.debugger.jpda.models.LocalsTreeModel.getChildren(LocalsTreeModel.java:119)
        at org.netbeans.spi.viewmodel.Models$DelegatingTreeModel.getChildren(Models.java:1148)
        at org.netbeans.modules.debugger.jpda.ui.models.VariablesTreeModelFilterSI.getChildren(VariablesTreeModelFilterSI.java:165)
        at org.netbeans.spi.viewmodel.Models$CompoundTreeModel.getChildren(Models.java:628)
        at org.netbeans.modules.debugger.jpda.ui.models.VariablesTreeModelFilter.getChildren(VariablesTreeModelFilter.java:191)
        at org.netbeans.spi.viewmodel.Models$CompoundTreeModel.getChildren(Models.java:628)
        at org.netbeans.spi.viewmodel.Models$CompoundModel.getChildren(Models.java:2819)
        at org.netbeans.modules.viewmodel.TreeModelNode$TreeModelChildren.evaluateLazily(TreeModelNode.java:701)
        at org.netbeans.modules.viewmodel.TreeModelNode$LazyEvaluator.run(TreeModelNode.java:1124)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:561)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:986)