IPWhitelist

[16:50:32 ERROR]: Could not pass event PlayerLoginEvent to IPWhitelist v1.6
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:294) ~[spigot.jar:git-Spigot-1357]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-1357]
        at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:30) ~[spigot.jar:git-Spigot-1357]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot.jar:git-Spigot-1357]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot.jar:git-Spigot-1357]
        at net.minecraft.server.v1_7_R2.PlayerList.attemptLogin(PlayerList.java:387) [spigot.jar:git-Spigot-1357]
        at net.minecraft.server.v1_7_R2.LoginListener.c(LoginListener.java:79) [spigot.jar:git-Spigot-1357]
        at net.minecraft.server.v1_7_R2.LoginListener.a(LoginListener.java:42) [spigot.jar:git-Spigot-1357]
        at net.minecraft.server.v1_7_R2.NetworkManager.a(NetworkManager.java:151) [spigot.jar:git-Spigot-1357]
        at net.minecraft.server.v1_7_R2.ServerConnection.c(ServerConnection.java:77) [spigot.jar:git-Spigot-1357]
        at net.minecraft.server.v1_7_R2.MinecraftServer.v(MinecraftServer.java:703) [spigot.jar:git-Spigot-1357]
        at net.minecraft.server.v1_7_R2.DedicatedServer.v(DedicatedServer.java:273) [spigot.jar:git-Spigot-1357]
        at net.minecraft.server.v1_7_R2.MinecraftServer.u(MinecraftServer.java:566) [spigot.jar:git-Spigot-1357]
        at net.minecraft.server.v1_7_R2.MinecraftServer.run(MinecraftServer.java:472) [spigot.jar:git-Spigot-1357]
        at net.minecraft.server.v1_7_R2.ThreadServerApplication.run(SourceFile:618) [spigot.jar:git-Spigot-1357]
Caused by: java.lang.NullPointerException
        at net.craftminecraft.bukkit.ipwhitelist.PlayerListener.getField(PlayerListener.java:81) ~[?:?]
Caused by: java.lang.NullPointerException
        at net.craftminecraft.bukkit.ipwhitelist.PlayerListener.getField(PlayerListener.java:81) ~[?:?]
        at net.craftminecraft.bukkit.ipwhitelist.PlayerListener.onPlayerLogin(PlayerListener.java:34) ~[?:?]
        at sun.reflect.GeneratedMethodAccessor21.invoke(Unknown Source) ~[?:?]
        at sun.reflect.GeneratedMethodAccessor21.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_51]
        at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_51]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:292) ~[spigot.jar:git-Spigot-1357]
        ... 14 more