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java.lang.NullPointerException: 	at net.sourceforge.htmlunit.corejs.javascript.Delegator.getPrototype(Delegator.java:173)	at net.sourceforge.htmlunit.corejs.javascript.ScriptableObject.getProperty(ScriptableObject.java:1619)	at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.getObjectProp(ScriptRuntime.java:1437)	at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.getObjectProp(ScriptRuntime.java:1423)	at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpretLoop(Interpreter.java:3027)	at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpret(Interpreter.java:2487)	at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.call(InterpretedFunction.java:164)	at com.gargoylesoftware.htmlunit.javascript.host.event.EventHandler.call(EventHandler.java:82)	at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.doTopCall(ContextFactory.java:398)	at com.gargoylesoftware.htmlunit.javascript.HtmlUnitContextFactory.doTopCall(HtmlUnitContextFactory.java:252)	at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3065)	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$4.doRun(JavaScriptEngine.java:828)	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:889)	at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:515)	at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:507)	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:835)	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:807)	at com.gargoylesoftware.htmlunit.InteractivePage.executeJavaScriptFunctionIfPossible(InteractivePage.java:216)	at com.gargoylesoftware.htmlunit.javascript.host.event.EventListenersContainer.executeEventHandler(EventListenersContainer.java:295)	at com.gargoylesoftware.htmlunit.javascript.host.event.EventListenersContainer.executeBubblingListeners(EventListenersContainer.java:315)	at com.gargoylesoftware.htmlunit.javascript.host.event.EventTarget.fireEvent(EventTarget.java:206)	at com.gargoylesoftware.htmlunit.html.DomElement$2.run(DomElement.java:1180)	at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:515)	at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:507)	at com.gargoylesoftware.htmlunit.html.DomElement.fireEvent(DomElement.java:1185)	at com.gargoylesoftware.htmlunit.html.HtmlPage.executeEventHandlersIfNeeded(HtmlPage.java:1213)	at com.gargoylesoftware.htmlunit.html.HtmlPage.initialize(HtmlPage.java:272)	at com.gargoylesoftware.htmlunit.WebClient.loadWebResponseInto(WebClient.java:518)	at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:385)	at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:303)	at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:450)	at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:435)	at com.siemens.isb.test.utils.webservice.browserclients.AppRouterClient.redirectPage(AppRouterClient.java:594)	at com.siemens.isb.test.utils.webservice.browserclients.AppRouterClient.main(AppRouterClient.java:555)