[07:11:19 INFO]: milk_milk issued server command: /shopmenu
[07:11:19 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'shop
menu' in plugin HyperMerchant v1.56
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spi
got.jar:git-Spigot-1591]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:18
1) ~[spigot.jar:git-Spigot-1591]
        at org.bukkit.craftbukkit.v1_7_R4.CraftServer.dispatchCommand(CraftServe
r.java:767) ~[spigot.jar:git-Spigot-1591]
        at net.minecraft.server.v1_7_R4.PlayerConnection.handleCommand(PlayerCon
nection.java:1013) [spigot.jar:git-Spigot-1591]
        at net.minecraft.server.v1_7_R4.PlayerConnection.a(PlayerConnection.java
:850) [spigot.jar:git-Spigot-1591]
        at net.minecraft.server.v1_7_R4.PacketPlayInChat.a(PacketPlayInChat.java
:28) [spigot.jar:git-Spigot-1591]
        at net.minecraft.server.v1_7_R4.PacketPlayInChat.handle(PacketPlayInChat
.java:65) [spigot.jar:git-Spigot-1591]
        at net.minecraft.server.v1_7_R4.NetworkManager.a(NetworkManager.java:184
) [spigot.jar:git-Spigot-1591]
        at net.minecraft.server.v1_7_R4.ServerConnection.c(ServerConnection.java
:81) [spigot.jar:git-Spigot-1591]
        at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:7
31) [spigot.jar:git-Spigot-1591]
        at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:2
89) [spigot.jar:git-Spigot-1591]
        at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:5
84) [spigot.jar:git-Spigot-1591]
        at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java
:490) [spigot.jar:git-Spigot-1591]
        at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:6
28) [spigot.jar:git-Spigot-1591]
Caused by: java.lang.NullPointerException
        at grokswell.hypermerchant.ShopMenu.UpdateSortingIcon(ShopMenu.java:297)
 ~[?:?]
        at grokswell.hypermerchant.ShopMenu.<init>(ShopMenu.java:88) ~[?:?]
        at grokswell.hypermerchant.HyperMerchantPlugin.onCommand(HyperMerchantPl
ugin.java:130) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spi
got.jar:git-Spigot-1591]
        ... 13 more