NullPointerException thrown wenn maximizing WebView during loading

I've opened the page http://www.rgraph.net/examples/index.html with WebView. My window is initally not maximized. If i maximize the window, before webview loads the page completely, then a NPE is thrown. However if i wait till the page is loaded fully and then maximize it, then it works normal. To test the WebView i've used the code from Example 3 from the doc (http://download.oracle.com/javafx/2.0/webview/jfxpub-webview.htm).


Stack trace is attached