error handling client message [C] 04 Action
java.lang.NullPointerException
        at net.sf.l2j.gameserver.SevenSigns.getSealOwner(SevenSigns.java:509)
        at net.sf.l2j.gameserver.model.actor.instance.L2NpcInstance.showChatWindow(L2NpcInstance.java:1761)
        at net.sf.l2j.gameserver.model.actor.instance.L2NpcInstance.onAction(L2NpcInstance.java:546)
        at net.sf.l2j.gameserver.model.actor.instance.L2MerchantInstance.onAction(L2MerchantInstance.java:63)
        at net.sf.l2j.gameserver.clientpackets.Action.runImpl(Action.java:93)
        at net.sf.l2j.gameserver.clientpackets.ClientBasePacket.run(ClientBasePacket.java:59)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)