Fixes #3112 (NPE)

L2_GameServer/java/net/sf/l2j/gameserver/model/CursedWeapon.java

@@ -381,6 +381,9 @@ public class CursedWeapon
 	
 	public void disableAllSkills()
 	{
+		if (_player == null || _player.getAllSkills().length == 0)
+			return;
+		
         for (L2Skill sk : _player.getAllSkills())
         {
         	if (sk != null && !sk.isPassive())