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

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java.lang.NullPointerException:
at org.archive.crawler.basic.CrawlStateUpdater.innerProcess(CrawlStateUpdater.java:57)
at org.archive.crawler.framework.Processor.process(Processor.java:101)
at org.archive.crawler.framework.ToeThread.processCrawlUri(ToeThread.java:169)
at org.archive.crawler.framework.ToeThread.run(ToeThread.java:124)

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