java.lang.IllegalStateException: No script object associated with the Page #171

May 12, 2020 5:42:24 PM com.gargoylesoftware.htmlunit.WebClient close
SEVERE: Exception while closing a topLevelWindow
java.lang.IllegalStateException: No script object associated with the Page. class: 'com.gargoylesoftware.htmlunit.html.HtmlPage' url: 'https://127.0.0.1:4443/thanks.html' content: <!doctype html>
<html lang="en">
<head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">

    <link rel="stylesheet" type="text/css" href="css/normalize.css">
    <link rel="stylesheet" type="text/css" href="css/main.css">

    <title>CovidSense</title>
</head>
<body>

<div id="header">
    CovidSense
</div>

<h2>
    <br>
    <br>
    <br>
    <br>
    Thanks for your participation! We truly appreciate it.<br>
    <br>
    <br>
    We will also appreciate if you could encourage your adult family members, friends and colleagues (who have their own mobile phones) to participate in the study. You can forward them the following text.
    <br>
    <br>
    I am a participant in this citizen science project on Covid-19 pandemic. I thought you might be interested. You can join the study at www.covidsense.org .</h2>

    <script>
    </script>
</body>
</html>
	at com.gargoylesoftware.htmlunit.html.DomNode.getScriptableObject(DomNode.java:945)
	at com.gargoylesoftware.htmlunit.javascript.host.event.Event.<init>(Event.java:217)
	at com.gargoylesoftware.htmlunit.javascript.host.event.BeforeUnloadEvent.<init>(BeforeUnloadEvent.java:71)
	at com.gargoylesoftware.htmlunit.html.HtmlPage.executeEventHandlersIfNeeded(HtmlPage.java:1240)
	at com.gargoylesoftware.htmlunit.html.HtmlPage.isOnbeforeunloadAccepted(HtmlPage.java:1320)
	at com.gargoylesoftware.htmlunit.TopLevelWindow.close(TopLevelWindow.java:115)
	at com.gargoylesoftware.htmlunit.WebClient.close(WebClient.java:2079)