JavaFX WebView Memory Leak

A DESCRIPTION OF THE PROBLEM :
We are using webview in our javafx desktop application. We are opening webview in a dialog to load one url. This dialog is opening on a button click. Whenever we click on that button to open a dialog , memory increases constantly.

REGRESSION : Last worked in version 10.0.2

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Just click the button to open a webview , It will increase the memory consumption.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
It should not increase the memory consumption as it sometimes lead to application crash.
ACTUAL -
It will increase the memory consumption.Resulting sometimes in application crash.

---------- BEGIN SOURCE ----------
public class HelpDialogController {

    @FXML
    private BorderPane helpDialogMainBorderPane;

    @FXML
    private WebView helpDialogWebView;

    public WebEngine webEngine;
    public static HelpDialogController instance;

    /**
     * Initializes the controller class.
     */
      @FXML
    public void initialize() {
        // TODO
        instance = this;
        webEngine = helpDialogWebView.getEngine();
        webEngine.load("https://csgpay.com/support?mobile_app=true");
        webEngine.setJavaScriptEnabled(true);
        // Delete cookies
        java.net.CookieHandler.setDefault(new java.net.CookieManager());
    }

---------- END SOURCE ----------

FREQUENCY : always