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java.lang.NullPointerException: 	at hudson.plugins.buildblocker.BlockingJobsMonitor.checkNodeForQueueEntries(BlockingJobsMonitor.java:108)	at hudson.plugins.buildblocker.BuildBlockerQueueTaskDispatcher.checkAccordingToProperties(BuildBlockerQueueTaskDispatcher.java:171)	at hudson.plugins.buildblocker.BuildBlockerQueueTaskDispatcher.checkForBlock(BuildBlockerQueueTaskDispatcher.java:127)	at hudson.plugins.buildblocker.BuildBlockerQueueTaskDispatcher.canTake(BuildBlockerQueueTaskDispatcher.java:110)	at hudson.model.Queue$JobOffer.canTake(Queue.java:258)	at hudson.model.Queue.maintain(Queue.java:1532)	at hudson.model.Queue$MaintainTask.doRun(Queue.java:2722)	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)