Bukkit

Steps to reproduce: Enter creative inventory, certain tabs or something causes it, not sure what exactly.

Expected Output: Nothing is suppose to happen, just use the creative inventory

Actual Output: Internal server error

Plugin Version: 1.4

CraftBukkit Build Number: MCPC+ 1.7.2

Pastebin Link to Error Logs:
[10:20:00 ERROR]: Could not pass event InventoryClickEvent to ItemRestrict v1.4
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:330) ~[JavaPluginLoader$1.class:git-MCPC-Plus-1.7.2-R0.4-forge1083-77]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62) ~[RegisteredListener.class:git-MCPC-Plus-1.7.2-R0.4-forge1083-77]
        at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredLi
stener.java:30) ~[TimedRegisteredListener.class:git-MCPC-Plus-1.7.2-R0.4-forge10
83-77]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:487) [SimplePluginManager.class:git-MCPC-Plus-1.7.2-R0.4-forge1083-77]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:472) [SimplePluginManager.class:git-MCPC-Plus-1.7.2-R0.4-forge1083-77]
        at net.minecraft.network.NetHandlerPlayServer.func_147351_a(NetHandlerPl
ayServer.java:2016) [mx.class:?]
        at net.minecraft.network.play.client.C0EPacketClickWindow.func_148833_a(
SourceFile:32) [il.class:?]
        at net.minecraft.network.play.client.C0EPacketClickWindow.func_148833_a(
SourceFile:10) [il.class:?]
        at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java
:206) [ef.class:?]
        at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:
173) [ms.class:?]
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.jav
a:929) [MinecraftServer.class:?]
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(Dedicated
Server.java:429) [lj.class:?]
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.jav
a:759) [MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:622) [M
inecraftServer.class:?]
        at java.lang.Thread.run(Unknown Source) [?:1.7.0_55]
Caused by: java.lang.NullPointerException
        at org.bukkit.craftbukkit.inventory.CraftInventoryView.getItem(CraftInve
ntoryView.java:64) ~[CraftInventoryView.class:git-MCPC-Plus-1.7.2-R0.4-forge1083
-77]
        at org.bukkit.event.inventory.InventoryClickEvent.getCurrentItem(Invento
ryClickEvent.java:118) ~[InventoryClickEvent.class:git-MCPC-Plus-1.7.2-R0.4-forg
e1083-77]
        at info.terrismc.itemrestrict.EventListener.onInventoryClick(EventListen
er.java:150) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0
_55]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0
_55]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1
.7.0_55]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_55]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:328) ~[JavaPluginLoader$1.class:git-MCPC-Plus-1.7.2-R0.4-forge1083-77]
        ... 14 more
[10:20:00 WARN]: Failed to handle packet for /10.0.0.14:51634
java.lang.IndexOutOfBoundsException: Index: 50, Size: 45
        at java.util.ArrayList.rangeCheck(Unknown Source) ~[?:1.7.0_55]
        at java.util.ArrayList.get(Unknown Source) ~[?:1.7.0_55]
        at net.minecraft.inventory.Container.func_75144_a(Container.java:379) ~[
ye.class:?]
        at net.minecraft.network.NetHandlerPlayServer.func_147351_a(NetHandlerPl
ayServer.java:2022) ~[mx.class:?]
        at net.minecraft.network.play.client.C0EPacketClickWindow.func_148833_a(
SourceFile:32) ~[il.class:?]
        at net.minecraft.network.play.client.C0EPacketClickWindow.func_148833_a(
SourceFile:10) ~[il.class:?]
        at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java
:206) ~[ef.class:?]
        at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:
173) [ms.class:?]
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.jav
a:929) [MinecraftServer.class:?]
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(Dedicated
Server.java:429) [lj.class:?]
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.jav
a:759) [MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:622) [M
inecraftServer.class:?]
        at java.lang.Thread.run(Unknown Source) [?:1.7.0_55]
[10:20:00 INFO]: OptiMus_sKiLLz lost connection: Internal server error

It seems to have to do with one of these blocks: track, stone stairs, lever, pressure plate, pressure plate (wooden), redstone ore, redstone torch, button, snow. When I scroll slowly in the search items tab from the row with the ladder being the last item on that row, to the row with the snow being last, it kicks me with internal server error.

It only does it when I have my mouse over the ladder and I scroll down to reveal the snow.

Did you reproduce it with MC1.7.10?