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java.lang.NullPointerException at water.UDPRebooted.closeAll(UDPRebooted.java:67) at water.UDPRebooted.suicide(UDPRebooted.java:42) at water.UDPRebooted.checkForSuicide(UDPRebooted.java:33) at water.UDPReceiverThread.basic_packet_handling(UDPReceiverThread.java:93) at water.UDPReceiverThread.run(UDPReceiverThread.java:53)