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

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java.lang.NullPointerException:
at org.archive.crawler.extractor.ExtractorHTML.processGeneralTag(ExtractorHTML.java:439)
at org.archive.crawler.extractor.ExtractorHTML.extract(ExtractorHTML.java:667)
at org.archive.crawler.extractor.ExtractorHTML.extract(ExtractorHTML.java:613)
at org.archive.crawler.extractor.Extractor.innerProcess(Extractor.java:67)
at org.archive.crawler.framework.Processor.process(Processor.java:109)
at org.archive.crawler.framework.ToeThread.processCrawlUri(ToeThread.java:306)
at org.archive.crawler.framework.ToeThread.run(ToeThread.java:154)

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