UltraBans DupeIP Error

2012-04-18 14:24:10 [WARNING] Unexpected exception while parsing console command

org.bukkit.command.CommandException: Unhandled exception executing command 'dupeip' in plugin UltraBan v0.2.3

    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:42)

    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:166)

    at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:473)

    at org.bukkit.craftbukkit.CraftServer.dispatchServerCommand(CraftServer.java:469)

    at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:596)

    at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:565)

    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:449)

    at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

Caused by: java.lang.NullPointerException

    at com.modcrafting.ultrabans.commands.DupeIP.onCommand(DupeIP.java:82)

    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:40)

    ... 7 more