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

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This exception has no message.
java.lang.NullPointerException:
at com.jaeksoft.searchlib.parser.htmlParser.HtmlDocumentProvider.getTitle(HtmlDocumentProvider.java:87)
at com.jaeksoft.searchlib.parser.htmlParser.HtmlDocumentProvider.score(HtmlDocumentProvider.java:78)
at com.jaeksoft.searchlib.parser.htmlParser.HtmlDocumentProvider.bestScore(HtmlDocumentProvider.java:150)
at com.jaeksoft.searchlib.parser.HtmlParser.findBestProvider(HtmlParser.java:224)
at com.jaeksoft.searchlib.parser.HtmlParser.parseContent(HtmlParser.java:305)
at com.jaeksoft.searchlib.parser.Parser.doParserContent(Parser.java:182)
at com.jaeksoft.searchlib.parser.Parser.parseStream(Parser.java:195)
at com.jaeksoft.searchlib.parser.ParserSelector.parseStream(ParserSelector.java:398)
at com.jaeksoft.searchlib.crawler.web.spider.Crawl.parseContent(Crawl.java:144)
at com.jaeksoft.searchlib.crawler.web.spider.Crawl.download(Crawl.java:269)
at com.jaeksoft.searchlib.crawler.web.process.WebCrawlThread.crawl(WebCrawlThread.java:176)
at com.jaeksoft.searchlib.crawler.web.process.WebCrawlThread.runner(WebCrawlThread.java:119)
at com.jaeksoft.searchlib.process.ThreadAbstract.run(ThreadAbstract.java:259)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)

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