A fatal error has been detected by the Java Runtime Environment: EXCEPTION_ACCESS_VIOLATION

I have a list of webpages and I want to read data from those pages. The problem is that those pages are written with Node.js and have some javascripts and I am forced to load those pages into a JavaFX.WebView (because webview has JavaScript engine) and get DOM of those pages from webview. I'm using a TransformerFactory to get the DOM.

The code runs smootly for a while but somehow after Visiting couple of pages my code suddenly stops. The log is like this:

#
# A fatal error has been detected by the Java Runtime Environment:
#
#  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x000000005a1597cb, pid=10044, tid=0x00000000000028b4
#
# JRE version: Java(TM) SE Runtime Environment (8.0_172-b11) (build 1.8.0_172-b11)

the full log is here hs_err_pid10044.log

Also the code snippet for page loading is like this (sorry it is in kotlin)

class ChildPageCrawl(url: String, path: String, semaphore: Semaphore) : JFrame() {
    init {
        title = "Web View"
        setSize(800, 600)
        val panel = JFXPanel()
        this.add(panel)
        Platform.runLater({
            val browser = WebView()
            val webEngine = browser.engine
            panel.scene = Scene(browser, 700.0, 500.0)
            webEngine.load(url)
            webEngine.loadWorker.stateProperty().addListener { _, _, newState ->
                if (newState == Worker.State.SUCCEEDED) {
                    Thread.sleep(10000) //Waiting for page to fully load
                    semaphore.acquire()
                    val doc = webEngine.document
                    val transformer = TransformerFactory.newInstance().newTransformer()
                    transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no")
                    transformer.setOutputProperty(OutputKeys.METHOD, "xml")
                    transformer.setOutputProperty(OutputKeys.INDENT, "yes")
                    transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8")
                    transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4")
                    val source = DOMSource(doc)
                    val writer = StringWriter()
                    val result = StreamResult(writer)
                    transformer.transform(source, result)
                    val str = writer.toString()
                    analyzeSML(str)
                    semaphore.release()
                }
            }
            })
        defaultCloseOperation = DISPOSE_ON_CLOSE
    }
}

I don't know where I'm going wrong, also the WebView, and the corresponding WebEngine seems to be slow since they render the webpage which is unnecessary for me.