Null pointer 30/7

Jul 30, 2005 10:11:43 AM net.sf.l2j.gameserver.clientpackets.ClientBasePacket run
SEVERE: error handling client message [C] 48 ValidatePosition
java.lang.NullPointerException
	at java.util.TreeMap.rotateLeft(Unknown Source)
	at java.util.TreeMap.fixAfterInsertion(Unknown Source)
	at java.util.TreeMap.put(Unknown Source)
	at java.util.TreeSet.add(Unknown Source)
	at net.sf.l2j.gameserver.Universe.registerHeight(Universe.java:351)
	at net.sf.l2j.gameserver.clientpackets.ValidatePosition.runImpl(ValidatePosition.java:80)
	at net.sf.l2j.gameserver.clientpackets.ClientBasePacket.run(ClientBasePacket.java:56)
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
	at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(Unknown Source)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)
	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)