java.lang.NullPointerException
   at org.netbeans.modules.debugger.jpda.models.CallStackFrameImpl.getOwnedMonitors(CallStackFrameImpl.java:965)
   at org.netbeans.modules.debugger.jpda.ui.models.DebuggingMonitorModel$Children.getChildren(DebuggingMonitorModel.java:273)
   at org.netbeans.modules.debugger.jpda.ui.models.DebuggingTreeModel.computeChildren(DebuggingTreeModel.java:151)
   at org.netbeans.modules.debugger.jpda.ui.models.CachedChildrenTreeModel.getChildren(CachedChildrenTreeModel.java:103)
   at org.netbeans.spi.viewmodel.Models$DelegatingTreeModel.getChildren(Models.java:1795)
   at org.netbeans.modules.debugger.jpda.js.frames.models.DebuggingJSFramesInJavaModelFilter.getChildren(DebuggingJSFramesInJavaModelFilter.java:96)
   at org.netbeans.spi.viewmodel.Models$CompoundTreeModel.getChildren(Models.java:954)
   at org.netbeans.modules.debugger.jpda.ui.models.HiddenCallStackFramesFilter.getChildren(HiddenCallStackFramesFilter.java:281)
   at org.netbeans.spi.viewmodel.Models$CompoundTreeModel.getChildren(Models.java:954)
   at org.netbeans.spi.viewmodel.Models$CompoundModel.getChildren(Models.java:4422)
   at org.netbeans.modules.viewmodel.TreeModelNode$TreeModelChildren.getModelChildren(TreeModelNode.java:1486)
   at org.netbeans.modules.viewmodel.TreeModelNode$TreeModelChildren.run(TreeModelNode.java:1446)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)