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

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java.lang.NullPointerException:
at org.opennms.web.svclayer.support.DefaultRequisitionAccessService$RequisitionAccessor.createSnapshot(DefaultRequisitionAccessService.java:441)
at org.opennms.web.svclayer.support.DefaultRequisitionAccessService$23.call(DefaultRequisitionAccessService.java:743)
at org.opennms.web.svclayer.support.DefaultRequisitionAccessService$23.call(DefaultRequisitionAccessService.java:741)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

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