Bukkit

What steps will reproduce the problem?
I use this plugin in my mob arena for the spell casting classes. When users first tp to the mobarena world the wand works fine but after the match is finished and they teleport back to spawn I get the error

What is the expected output? What do you see instead?
15:20:55 [SEVERE] Could not pass event PlayerInteractEvent to MagicalSpells
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:332)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
        at org.bukkit.craftbukkit.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:177)
        at net.minecraft.server.ItemInWorldManager.interact(ItemInWorldManager.java:355)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:649)
        at net.minecraftserverhook.NetServerHandlerProxy.a(NetServerHandlerProxy.java:94)
        at net.minecraft.server.Packet15Place.handle(SourceFile:58)
        at net.minecraft.server.NetworkManager.b(NetworkManager.java:276)
        at net.minecraft.server.NetServerHandler.d(NetServerHandler.java:109)
        at net.minecraft.server.ServerConnection.b(SourceFile:35)
        at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
        at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:581)
        at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:212)
        at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:474)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:406)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
Caused by: java.lang.NullPointerException
        at Squish000.MagicalWands.MagicalPlayer.cycleSpell(MagicalPlayer.java:534)
        at Squish000.MagicalWands.PlayerListener.onPlayerInteract(PlayerListener.java:117)
        at sun.reflect.GeneratedMethodAccessor83.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:601)
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:330)
        ... 17 more

What version of the product are you using?
Latest

Please provide any additional information below.
I think this may be caused by one of your iterators not resetting on death or world tp maybe in your cycleSpell method. Any idea on how to fix this atm my players are just using /ms reload which is ok for now but my players and I love this mod it would be nice if it was fixed :D