RoboCup-SPL/GameController

Strange NullPointerException

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edran commented 
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at controller.EventHandler.update(Unknown Source)
    at controller.EventHandler.access$000(Unknown Source)
    at controller.EventHandler$1.run(Unknown Source)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:226)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:673)
    at java.awt.EventQueue.access$300(EventQueue.java:96)
    at java.awt.EventQueue$2.run(EventQueue.java:634)
    at java.awt.EventQueue$2.run(EventQueue.java:632)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:643)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at controller.EventHandler.update(Unknown Source)
    at controller.EventHandler.access$000(Unknown Source)
    at controller.EventHandler$1.run(Unknown Source)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:226)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:673)
    at java.awt.EventQueue.access$300(EventQueue.java:96)
    at java.awt.EventQueue$2.run(EventQueue.java:634)
    at java.awt.EventQueue$2.run(EventQueue.java:632)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:643)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)

using java-7-openjdk-amd64/ and Ubuntu 11.10 / 12.04. Moreover, I can't quite reproduce it all the time, so it may be related to some timing issues between the threads?