SparkTrail Bug

[18/03/2014]---[01:31:52][SparkTrail] §c[SEVERE] Encountered exception in Trail Menu
java.lang.NullPointerException
	at com.dsh105.sparktrail.util.Permission.hasEffectPerm(Permission.java:81)
	at com.dsh105.sparktrail.menu.MenuListener.onInvClick(MenuListener.java:94)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:318)
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
	at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:47)
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:487)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:472)
	at net.minecraft.server.v1_7_R1.PlayerConnection.a(PlayerConnection.java:1403)
	at net.minecraft.server.v1_7_R1.PacketPlayInWindowClick.a(SourceFile:32)
	at net.minecraft.server.v1_7_R1.PacketPlayInWindowClick.handle(SourceFile:10)
	at net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:147)
	at net.minecraft.server.v1_7_R1.ServerConnection.c(ServerConnection.java:77)
	at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:700)
	at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:273)
	at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:562)
	at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:469)
	at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617)