SecurityException on closing the application

[SnorreDev]

Hello,

I got a problem when I'm trying to close my J2ME Application on a real device not the emulator.
When I use it on the emulator from Nokia ( 7210 ) it works quite well.

When I'm trying to close the application on my Mobile Phone, it throw's an Security Exception but why?

The Midlet code is:

/* This file was created by Nokia Developer's Suite for J2ME(TM) */

package inselwelt;

import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;

public class Inselwelt
extends MIDlet{
	public static Display display;
	public static inselwelt.InselweltGame canvas;

	public Inselwelt() {
		canvas = new inselwelt.InselweltGame();
		Display.getDisplay(this).setCurrent(canvas);
		InselweltGame.midlet = this;
	}

	protected void destroyApp(boolean p1)
	throws MIDletStateChangeException {
		display = null;
		System.gc();
		destroyApp(false);
	}

	protected void startApp(  ) throws MIDletStateChangeException
	{
		Display.getDisplay(this).setCurrent(canvas);
	}

	protected void pauseApp() {
	}
}

Can someone give me a hint what I made wrong?

Thanks in advance!

cheers,
Sven