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

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java.lang.NullPointerException:
at org.icepush.LocalPushGroupManager$Notification.equals(LocalPushGroupManager.java:855)
at java.util.concurrent.LinkedBlockingQueue.remove(LinkedBlockingQueue.java:553)
at org.icepush.LocalPushGroupManager$QueueConsumerTask.run(LocalPushGroupManager.java:983)
at java.util.TimerThread.mainLoop(Timer.java:555)
at java.util.TimerThread.run(Timer.java:505)

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