Bukkit

What steps will reproduce the problem?
1. bLift 1.2
2. CB 1.2.5 Build 2149 RB
3. Java 7.3

What is the expected output? What do you see instead?
No errors please :D

What version of the product are you using?
bLift 1.2

Do you have an error log of what happened?
2012-04-12 19:54:10 [SEVERE] Could not pass event BlockRedstoneEvent to bLift
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:303)
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:459)
    at net.minecraft.server.BlockButton.interact(BlockButton.java:142)
    at net.minecraft.server.ItemInWorldManager.interact(ItemInWorldManager.java:296)
    at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:636)
    at net.minecraft.serverhook.NetServerHandlerProxy.a(NetServerHandlerProxy.java:119)
    at net.minecraft.server.Packet15Place.handle(SourceFile:39)
    at net.minecraft.server.NetworkManager.b(NetworkManager.java:229)
    at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:113)
    at net.minecraft.serverhook.NetServerHandlerProxy.a(NetServerHandlerProxy.java:83)
    at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:78)
    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.NullPointerException
    at com.bradsproject.BradleyJewell.bLift.MultiElevator.isInMultiElevator(MultiElevator.java:96)
    at com.bradsproject.BradleyJewell.bLift.MultiElevator.prepareMultiElevator(MultiElevator.java:56)
    at com.bradsproject.BradleyJewell.bLift.MultiElevator.<init>(MultiElevator.java:38)
    at com.bradsproject.BradleyJewell.bLift.Elevator.<init>(Elevator.java:34)
    at com.bradsproject.BradleyJewell.bLift.bLiftRedstoneListener.onBlockRedstoneChange(bLiftRedstoneListener.java:23)
    at sun.reflect.GeneratedMethodAccessor19.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.java:301)
    ... 14 more

Please provide any additional information below.
This occures from time to time but I can't figure out why.

I'll see if I can recreate this and try and figure out what the problem might be. Are there any particular actions which seem to cause this to happen?