🚀 go-pugleaf

I start a 1.1 applet that includes a jar file on Netscape 4.x browser on
NT 4.0 or 95. The applet works fine. After I close the window that
contains the applet, the Java Console reports:
java.lang.NullPointerException: invalid peer
  at java.awt.TextComponent.removeNotify(Compiled Code)
  at java.awt.Container.removeNotify(Compiled Code)
  at java.awt.Container.removeNotify(Compiled Code)
  at symantec.itools.awt.BorderPanel.removeNotify(Compiled Code)
  at java.awt.Container.removeNotify(Compiled Code)
  at java.awt.Container.removeNotify(Compiled Code)
  at java.awt.Container.remove(Compiled Code)
  at java.awt.Container.remove(Compiled Code)
* at
netscape.applet.DerivedAppletFrame$DisposeAppletEvent.dispatch(Compiled
Code)
  at java.awt.EventDispatchThread$EventPump.dispatchEvents(Compiled
Code)
  at java.awt.EventDispatchThread.run(Compiled Code)
  at
netscape.applet.DerivedAppletFrame$AppletEventDispatchThread.run(Compiled
Code)

The CPU resource meter (Task Manager in NT) now shows 100% usage in
Netscape but Netscape does not GPF out.

This does not occur on Applet Viewer or Internet Explorer 4.72 on NT Svc
Pack 4.

It makes no difference if I actually use the applet or not. The applet
carries a number of frames, a few Symantec components from Visual Cafe
2.5A and URLConnection classes. There are no menu components and I don't
attempt to make the URLConnection to experience this problem.

Anyone have any ideas?