java.lang.AssertionError
   at org.netbeans.lib.profiler.results.locks.ThreadInfo.openMonitor(ThreadInfo.java:72)
   at org.netbeans.lib.profiler.results.locks.LockGraphBuilder.monitorEntry(LockGraphBuilder.java:142)
   at org.netbeans.lib.profiler.results.locks.AbstractLockDataFrameProcessor$1.execute(AbstractLockDataFrameProcessor.java:58)
   at org.netbeans.lib.profiler.results.AbstractDataFrameProcessor.foreachListener(AbstractDataFrameProcessor.java:175)
   at org.netbeans.lib.profiler.results.locks.AbstractLockDataFrameProcessor.fireMonitorEntry(AbstractLockDataFrameProcessor.java:56)
   at org.netbeans.lib.profiler.results.locks.LockDataFrameProcessor.doProcessDataFrame(LockDataFrameProcessor.java:130)
   at org.netbeans.lib.profiler.results.AbstractDataFrameProcessor.processDataFrame(AbstractDataFrameProcessor.java:96)
   at org.netbeans.lib.profiler.results.ProfilingResultsDispatcher$4.run(ProfilingResultsDispatcher.java:234)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
   at java.util.concurrent.FutureTask.run(FutureTask.java:262)
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
   at java.lang.Thread.run(Thread.java:745)