GlobalMarket Blacklist NPE

2013-06-15 09:55:11 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'market' in plugin GlobalMarket v1.2.2-SNAPSHOT
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46)
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:189)
    at org.bukkit.craftbukkit.v1_5_R3.CraftServer.dispatchCommand(CraftServer.java:546)
    at net.minecraft.server.v1_5_R3.PlayerConnection.handleCommand(PlayerConnection.java:985)
    at net.minecraft.server.v1_5_R3.PlayerConnection.chat(PlayerConnection.java:901)
    at net.minecraft.server.v1_5_R3.PlayerConnection.a(PlayerConnection.java:846)
    at net.minecraft.server.v1_5_R3.Packet3Chat.handle(Packet3Chat.java:44)
    at org.spigotmc.netty.NettyNetworkManager.b(NettyNetworkManager.java:218)
    at net.minecraft.server.v1_5_R3.PlayerConnection.d(PlayerConnection.java:115)
    at net.minecraft.server.v1_5_R3.ServerConnection.b(SourceFile:35)
    at org.spigotmc.MultiplexingServerConnection.b(MultiplexingServerConnection.java:72)
    at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:583)
    at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:227)
    at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:472)
    at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:404)
    at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.NullPointerException
    at com.survivorserver.GlobalMarket.Market.itemBlacklisted(Market.java:289)
    at com.survivorserver.GlobalMarket.Market.onCommand(Market.java:554)
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
    ... 15 more