java.lang.NullPointerException: This exception has no message.

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at hudson.plugins.throttleconcurrents.ThrottleQueueTaskDispatcher.buildsOfProjectOnNode(
at hudson.plugins.throttleconcurrents.ThrottleQueueTaskDispatcher.canTake(
at hudson.model.queue.QueueTaskDispatcher.canTake(
at hudson.model.Queue$JobOffer.canTake(
at hudson.model.Queue.pop(
at hudson.model.Executor.grabJob(

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