Bukkit

What steps will reproduce the problem?
1. People Trying To Open /Shop?
2.
3.

What is the expected output? What do you see instead?
No Eror

What version of the product are you using?

v3.0

Do you have an error log of what happened?

net.minecraft.server.v1_6_R3.ThreadServerApplication.run(SourceFile:583)
Caused by: java.lang.NullPointerException
        at com.roguepanda.rptokens.TokenShop.playerInteract(TokenShop.java:473)
        at sun.reflect.GeneratedMethodAccessor172.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:425)
        ... 17 more
19:08:52 [SEVERE] Could not pass event PlayerInteractEvent to TokenShop v1.3
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
        at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:30)
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:478)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:463)
        at org.bukkit.craftbukkit.v1_6_R3.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:207)
        at org.bukkit.craftbukkit.v1_6_R3.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:177)
        at net.minecraft.server.v1_6_R3.PlayerConnection.a(PlayerConnection.java:610)
        at net.minecraft.server.v1_6_R3.Packet15Place.handle(SourceFile:58)
        at org.spigotmc.netty.NettyNetworkManager.b(NettyNetworkManager.java:230)
        at net.minecraft.server.v1_6_R3.PlayerConnection.e(PlayerConnection.java:116)
        at net.minecraft.server.v1_6_R3.ServerConnection.b(SourceFile:37)
        at org.spigotmc.netty.NettyServerConnection.b(NettyServerConnection.java:132)
        at net.minecraft.server.v1_6_R3.MinecraftServer.t(MinecraftServer.java:594)
        at net.minecraft.server.v1_6_R3.DedicatedServer.t(DedicatedServer.java:240)
        at net.minecraft.server.v1_6_R3.MinecraftServer.s(MinecraftServer.java:483)
        at net.minecraft.server.v1_6_R3.MinecraftServer.run(MinecraftServer.java:415)
        at net.minecraft.server.v1_6_R3.ThreadServerApplication.run(SourceFile:583)
Caused by: java.lang.NullPointerException
        at com.roguepanda.rptokens.TokenShop.playerInteract(TokenShop.java:473)
        at sun.reflect.GeneratedMethodAccessor172.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:42

Please provide any additional information below.

It may not stop the player from using /shop but it still brings up the annoying error. Please take your time. I am not in a rush.
Thanks.