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

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java.lang.NullPointerException:
at org.sonatype.timeline.internal.DefaultTimeline.purgeOlderThan(DefaultTimeline.java:165)
at org.sonatype.nexus.timeline.DefaultNexusTimeline.purgeOlderThan(DefaultNexusTimeline.java:157)
at org.sonatype.nexus.timeline.tasks.PurgeTimeline.doRun(PurgeTimeline.java:50)
at org.sonatype.scheduling.DefaultScheduledTask.call(DefaultScheduledTask.java:418)
at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292)
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:744)

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