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

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java.lang.NullPointerException:
at org.archive.crawler.framework.StatisticsTrackerImpl.writeCrawlReportTo(StatisticsTrackerImpl.java:1139)
at org.archive.crawler.framework.StatisticsTrackerImpl.writeReportTo(StatisticsTrackerImpl.java:1200)
at org.archive.crawler.framework.StatisticsTrackerImpl.writeReportFile(StatisticsTrackerImpl.java:1168)
at org.archive.crawler.framework.StatisticsTrackerImpl.dumpReports(StatisticsTrackerImpl.java:1235)
at org.archive.crawler.framework.AbstractTracker.finalTasks(AbstractTracker.java:318)
at org.archive.settings.SheetManager.closeModules(SheetManager.java:373)
at org.archive.crawler.framework.CrawlControllerImpl.completeStop(CrawlControllerImpl.java:564)
at org.archive.crawler.framework.CrawlControllerImpl.noteFrontierState(CrawlControllerImpl.java:1169)
at org.archive.crawler.frontier.AbstractFrontier.reachedState(AbstractFrontier.java:497)
at org.archive.crawler.frontier.AbstractFrontier.managementTasks(AbstractFrontier.java:433)
at org.archive.crawler.frontier.AbstractFrontier$2.run(AbstractFrontier.java:345)

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