Bukkit

What steps will reproduce the problem?
No conclusive way to repreduce the problem, it happens every now and then but mainly happens for users who are far out in the world +1500x border

What is the expected output? What do you see instead?
Not expecting any output, the plugin stops working in an area and when we replace the sign the error code below spits out in the console.

What version of the product are you using?
Latest

Do you have an error log of what happened? (dosnt spit out an error, just stops working. the error code is only when you replace a sign in the area where it isnt working in)

[SEVERE] Could not pass event SIGN_CHANGE to ElectriCraft
java.lang.ClassCastException: org.bukkit.material.MaterialData cannot be cast to org.bukkit.material.Sign
at me.RSGMercenary.ElectriCraft.ECSign.<init>(ECSign.java:23)
at me.RSGMercenary.ElectriCraft.ECBlockListener.onSignChange(ECBlockListener.java:151)
at org.bukkit.plugin.java.JavaPluginLoader$36.execute(JavaPluginLoader.java:519)
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:341)
at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:1094)
at net.minecraft.server.Packet130UpdateSign.handle(SourceFile:41)
at net.minecraft.server.NetworkManager.b(NetworkManager.java:226)
at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:100)
at net.minecraft.server.NetworkListenThread.a(SourceFile:108)
at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:536)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:434)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:465)

Please provide any additional information below.
using Nolagg to handle chunk loading, and multihome so people can teleport around in the world. i have no idea if this has any effect on the problem we havnt been able to confirm or deny this.