Index: C:/eclipse/workspace/L2_GameServer_c4/java/net/sf/l2j/gameserver/clientpackets/EnterWorld.java
===================================================================
--- C:/eclipse/workspace/L2_GameServer_c4/java/net/sf/l2j/gameserver/clientpackets/EnterWorld.java	(revision 1508)
+++ C:/eclipse/workspace/L2_GameServer_c4/java/net/sf/l2j/gameserver/clientpackets/EnterWorld.java	(working copy)
@@ -74,8 +74,18 @@
 	void runImpl()
 	{
 		L2PcInstance activeChar = getClient().getActiveChar();
-		if (activeChar == null)
-		    return;
+		
+		if (activeChar == null)
+		{
+			_log.warning("EnterWorld failed! activeChar is null...");
+		    return;
+		}
+		
+		if(L2World.getInstance().findObject(activeChar.getObjectId()) != null)
+		{
+			_log.warning("User already exist in OID map! User "+activeChar.getName()+" are character clone");
+			activeChar.closeNetConnection();
+		}
         
         if(activeChar.isGM() && activeChar.getAccessLevel()>9)
         {