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java.util.ConcurrentModificationException at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372) at java.util.AbstractList$Itr.next(AbstractList.java:343) at hudson.plugins.throttleconcurrents.ThrottleJobProperty$DescriptorImpl.getCategoryByName(ThrottleJobProperty.java:170) at hudson.plugins.throttleconcurrents.ThrottleQueueTaskDispatcher.canRun(ThrottleQueueTaskDispatcher.java:118) at hudson.plugins.throttleconcurrents.ThrottleQueueTaskDispatcher.canRun(ThrottleQueueTaskDispatcher.java:88) at hudson.model.Queue.isBuildBlocked(Queue.java:943) at hudson.model.Queue.maintain(Queue.java:984) at hudson.model.Queue.pop(Queue.java:863) at hudson.model.Executor.grabJob(Executor.java:285) at hudson.model.Executor.run(Executor.java:206)