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

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This exception has no message.
java.util.ConcurrentModificationException:
at java.util.PriorityQueue$Itr.next(PriorityQueue.java:464)
at com.gargoylesoftware.htmlunit.javascript.background.JavaScriptJobManagerImpl.removeAllJobs(JavaScriptJobManagerImpl.java:142)
at com.gargoylesoftware.htmlunit.WebWindowImpl.destroyChildren(WebWindowImpl.java:172)
at com.gargoylesoftware.htmlunit.WebWindowImpl.setEnclosedPage(WebWindowImpl.java:110)
at com.gargoylesoftware.htmlunit.html.HTMLParser.parse(HTMLParser.java:186)
at com.gargoylesoftware.htmlunit.html.HTMLParser.parseHtml(HTMLParser.java:165)
at com.gargoylesoftware.htmlunit.DefaultPageCreator.createHtmlPage(DefaultPageCreator.java:225)
at com.gargoylesoftware.htmlunit.DefaultPageCreator.createPage(DefaultPageCreator.java:108)

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