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java.lang.NullPointerException: No document element (about:blank)	at com.gargoylesoftware.htmlunit.html.HtmlPage.executeEventHandlersIfNeeded(HtmlPage.java:1165)	at com.gargoylesoftware.htmlunit.html.HtmlPage.cleanUp(HtmlPage.java:243)	at com.gargoylesoftware.htmlunit.WebWindowImpl.destroyChildren(WebWindowImpl.java:178)	at com.gargoylesoftware.htmlunit.WebWindowImpl.setEnclosedPage(WebWindowImpl.java:106)	at com.gargoylesoftware.htmlunit.html.HTMLParser.parse(HTMLParser.java:200)	at com.gargoylesoftware.htmlunit.html.HTMLParser.parseHtml(HTMLParser.java:179)	at com.gargoylesoftware.htmlunit.DefaultPageCreator.createHtmlPage(DefaultPageCreator.java:221)	at com.gargoylesoftware.htmlunit.DefaultPageCreator.createPage(DefaultPageCreator.java:106)	at com.gargoylesoftware.htmlunit.WebClient.loadWebResponseInto(WebClient.java:436)	at com.gargoylesoftware.htmlunit.WebClient.loadDownloadedResponses(WebClient.java:2199)	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.doProcessPostponedActions(JavaScriptEngine.java:624)	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.processPostponedActions(JavaScriptEngine.java:706)	at com.gargoylesoftware.htmlunit.html.HtmlElement.click(HtmlElement.java:1247)	at com.gargoylesoftware.htmlunit.html.HtmlElement.click(HtmlElement.java:1190)