13:48:48 [SEVERE] Could not pass event InventoryClickEvent to EchoPet v2.0.11-SNAPSHOT
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
        at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:47)
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:478)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:463)
        at net.minecraft.server.v1_6_R3.PlayerConnection.a(PlayerConnection.java:1401)
        at net.minecraft.server.v1_6_R3.Packet102WindowClick.handle(SourceFile:31)
        at org.spigotmc.netty.NettyNetworkManager.b(NettyNetworkManager.java:230)
        at net.minecraft.server.v1_6_R3.PlayerConnection.e(PlayerConnection.java:116)
        at net.minecraft.server.v1_6_R3.ServerConnection.b(SourceFile:37)
        at org.spigotmc.netty.NettyServerConnection.b(NettyServerConnection.java:132)
        at net.minecraft.server.v1_6_R3.MinecraftServer.t(MinecraftServer.java:594)
        at net.minecraft.server.v1_6_R3.DedicatedServer.t(DedicatedServer.java:240)
        at net.minecraft.server.v1_6_R3.MinecraftServer.s(MinecraftServer.java:483)
        at net.minecraft.server.v1_6_R3.MinecraftServer.run(MinecraftServer.java:415)
        at net.minecraft.server.v1_6_R3.ThreadServerApplication.run(SourceFile:583)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 3
        at net.minecraft.server.v1_6_R3.InventoryMerchant.getItem(InventoryMerchant.java:56)
        at org.bukkit.craftbukkit.v1_6_R3.inventory.CraftInventory.getItem(CraftInventory.java:49)
        at com.github.dsh105.echopet.listeners.MenuListener.onInventoryClick(MenuListener.java:54)
        at sun.reflect.GeneratedMethodAccessor192.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
        ... 15 more