16:36:01 [WARNING] Task of 'Citizens' generated an exception
java.lang.NullPointerException
        at com.citizens.economy.ItemInterface.hasEnough(ItemInterface.java:83)
        at com.citizens.economy.EconomyHandler.canBuy(EconomyHandler.java:166)
        at com.citizens.npctypes.traders.TraderTask.checkMiscellaneous(TraderTas
k.java:270)
        at com.citizens.npctypes.traders.TraderTask.handleTraderClick(TraderTask
.java:159)
        at com.citizens.npctypes.traders.TraderTask.run(TraderTask.java:88)
        at org.bukkit.craftbukkit.scheduler.CraftScheduler.mainThreadHeartbeat(C
raftScheduler.java:137)
        at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:438)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:361)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:422)