java.lang.NullPointerException
   at org.netbeans.modules.profiler.heapwalk.model.ObjectNode$1.computeChildren(ObjectNode.java:165)
   at org.netbeans.modules.profiler.heapwalk.model.BrowserUtils$1$1.run(BrowserUtils.java:231)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1356)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1894)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NullPointerException
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:355)
   at org.netbeans.modules.profiler.heapwalk.model.BrowserUtils.performTask(BrowserUtils.java:257)
   at org.netbeans.modules.profiler.heapwalk.model.BrowserUtils$1.run(BrowserUtils.java:224)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:131)
   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)