java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.freeplane.view.swing.ui.UserInputListenerFactory.updateMenus(UserInputListenerFactory.java:446)
at org.freeplane.features.mode.ModeController.updateMenus(ModeController.java:384)
at org.freeplane.main.application.FreeplaneGUIStarter.buildMenus(FreeplaneGUIStarter.java:314)
at org.freeplane.main.application.FreeplaneGUIStarter.buildMenus(FreeplaneGUIStarter.java:306)
at org.freeplane.main.osgi.ActivatorImpl$2.run(ActivatorImpl.java:239)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
at org.GNOME.Accessibility.AtkWrapper$5.dispatchEvent(AtkWrapper.java:697)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

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