Mon Sep 10 08:52:20 CEST 2001: java.lang.NullPointerException: null
java.lang.NullPointerException
        at org.openide.util.enum.QueueEnumeration.put(QueueEnumeration.java:70)
        at org.openide.awt.UndoRedo$Manager.discardAllEdits(UndoRedo.java:128)
        at org.openide.text.CloneableEditorSupport.doCloseDocument(CloneableEditorSupport.java:1108)
        at org.openide.text.CloneableEditorSupport.closeDocument(CloneableEditorSupport.java:1084)
        at org.openide.text.CloneableEditorSupport.notifyClosed(CloneableEditorSupport.java:933)
        at org.openide.text.CloneableEditor.closeLast(CloneableEditor.java:274)
        at org.openide.windows.CloneableTopComponent$Ref.unregister(CloneableTopComponent.java:286)
        at org.openide.windows.CloneableTopComponent.canClose(CloneableTopComponent.java:143)
        at org.openide.text.CloneableEditor.canClose(CloneableEditor.java:144)
        at org.openide.windows.TopComponent.close(TopComponent.java:251)
        at org.openide.windows.TopComponent.close(TopComponent.java:226)
        at org.netbeans.core.windows.ModeImpl.frameClosing(ModeImpl.java:1162)
        at org.netbeans.core.windows.frames.WindowFrameListenerAdapter.windowClosing(WindowFrameListenerAdapter.java:60)
        at java.awt.AWTEventMulticaster.windowClosing(AWTEventMulticaster.java:291)
        at java.awt.AWTEventMulticaster.windowClosing(AWTEventMulticaster.java:290)
        at java.awt.Window.processWindowEvent(Window.java:800)
        at javax.swing.JFrame.processWindowEvent(JFrame.java:237)
        at java.awt.Window.processEvent(Window.java:776)
        at java.awt.Component.dispatchEventImpl(Component.java:2593)
        at java.awt.Container.dispatchEventImpl(Container.java:1213)
        at java.awt.Window.dispatchEventImpl(Window.java:914)
        at java.awt.Component.dispatchEvent(Component.java:2497)
[catch] at java.awt.EventQueue.dispatchEvent(EventQueue.java:339)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:131)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:98)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:85)