Drugmeup Error

Could not pass event PlayerInteractEvent to DrugMeUp v0.7
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:35)
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
        at org.bukkit.craftbukkit.v1_5_R3.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:186)
        at org.bukkit.craftbukkit.v1_5_R3.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:156)
        at net.minecraft.server.v1_5_R3.PlayerConnection.a(PlayerConnection.java:611)
        at net.minecraft.server.v1_5_R3.Packet15Place.handle(SourceFile:58)
        at net.minecraft.server.v1_5_R3.NetworkManager.b(NetworkManager.java:292)
        at net.minecraft.server.v1_5_R3.PlayerConnection.d(PlayerConnection.java:109)
        at net.minecraft.server.v1_5_R3.ServerConnection.b(SourceFile:35)
        at net.minecraft.server.v1_5_R3.DedicatedServerConnection.b(SourceFile:30)
        at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:581)
        at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:226)
        at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:477)
        at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:410)
        at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.NullPointerException
        at me.giinger.dmu.PlayerListener.doNegatives(PlayerListener.java:124)
        at me.giinger.dmu.PlayerListener.onPlayerInteract(PlayerListener.java:60)
        at sun.reflect.GeneratedMethodAccessor149.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