error handling client message [C] 04 Action
java.lang.NullPointerException
        at net.sf.l2j.gameserver.SevenSigns.getSealOwner(SevenSigns.java:513)
        at net.sf.l2j.gameserver.model.actor.instance.L2NpcInstance.showChatWindow(L2NpcInstance.java:1646)
        at net.sf.l2j.gameserver.model.actor.instance.L2NpcInstance.onAction(L2NpcInstance.java:541)
        at net.sf.l2j.gameserver.clientpackets.Action.runImpl(Action.java:90)
        at net.sf.l2j.gameserver.clientpackets.ClientBasePacket.run(ClientBasePacket.java:57)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
        at java.lang.Thread.run(Thread.java:595)