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another icegridgui backtrace

Here's another backtrace I got this morning from IceGridGUI when performing an updating. The program continues running just fine:

java.lang.NullPointerException
at IceGridGUI.Application.Nodes.update(Nodes.java:224)
at IceGridGUI.Application.Root.update(Root.java:1116)
at IceGridGUI.Coordinator.applicationUpdated(Coordinator.java:765)
at IceGridGUI.ApplicationObserverI$3.run(ApplicationObserverI.java:140)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)