Sign Utilities

22:13:32 [SEVERE] Could not pass event SignChangeEvent to SignUtilities
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:303)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:459)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:1265)
        at net.minecraft.serverhook.NetServerHandlerProxy.a(NetServerHandlerProx
y.java:216)
        at net.minecraft.server.Packet130UpdateSign.handle(SourceFile:41)
        at net.minecraft.server.NetworkManager.b(NetworkManager.java:229)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:113)
        at net.minecraft.serverhook.NetServerHandlerProxy.a(NetServerHandlerProx
y.java:83)
        at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:7
8)
        at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:551)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:449)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range:
 6
        at java.lang.String.substring(Unknown Source)
        at com.timcolonel.SignUtilities.Listeners.SUBlockListener.onSignChange(S
UBlockListener.java:113)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:301)
        ... 12 more