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java.lang.NullPointerException: 	at hudson.model.ParametersAction.getAssignedLabel(ParametersAction.java:140)	at hudson.model.Queue$Item.getAssignedLabelFor(Queue.java:2079)	at hudson.model.Label$1.matches(Label.java:120)	at hudson.model.LoadStatistics.computeSnapshot(LoadStatistics.java:361)	at hudson.model.LoadStatistics$LoadStatisticsUpdater.doRun(LoadStatistics.java:395)	at hudson.triggers.SafeTimerTask.run(SafeTimerTask.java:50)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)	at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)	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:724)