java.util.ConcurrentModificationException: This exception has no message.

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java.util.ConcurrentModificationException:
at java.util.ArrayList$Itr.next(ArrayList.java:760)
at com.jaeksoft.searchlib.crawler.web.database.UrlManager.updateUrlItems(Unknown Source)
at com.jaeksoft.searchlib.crawler.web.database.UrlCrawlQueue.insertCollection(Unknown Source)
at com.jaeksoft.searchlib.crawler.web.database.UrlCrawlQueue.indexWork(Unknown Source)
at com.jaeksoft.searchlib.crawler.common.process.CrawlQueueAbstract.index(Unknown Source)
at com.jaeksoft.searchlib.crawler.web.process.WebCrawlMaster.runner(Unknown Source)
at com.jaeksoft.searchlib.process.ThreadAbstract.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:636)

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