Bukkit

What steps will reproduce the problem?
1. Have a creeper blow up with the magical creeper mod installed

What is the expected output? What do you see instead?
Mod seems to behave normally despite the exception? Players get debuffs such as blinding and hunger, and take no damage.

What version of the product are you using?
1.0 for CB 1.2.5-R4.0

Do you have an error log of what happened?
[SEVERE] Could not pass event EntityDamageByEntityEvent to Magical Creepers
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:464)
        at net.minecraft.server.Explosion.a(Explosion.java:160)
        at net.minecraft.server.World.createExplosion(World.java:1560)
        at net.minecraft.server.WorldServer.createExplosion(WorldServer.java:241)
        at net.minecraft.server.EntityCreeper.F_(EntityCreeper.java:79)
        at net.minecraft.server.World.entityJoinedWorld(World.java:1282)
        at net.minecraft.server.WorldServer.entityJoinedWorld(WorldServer.java:107)
        at net.minecraft.server.World.playerJoinedWorld(World.java:1264)
        at net.minecraft.server.World.tickEntities(World.java:1165)
        at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:547)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:453)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
Caused by: java.lang.ClassCastException: org.bukkit.craftbukkit.entity.CraftItem cannot be cast to org.bukkit.entity.LivingEntity
        at com.olympuspvp.caldabeast.MagicalCreepers.addRandomEffect(MagicalCreepers.java:69)
        at com.olympuspvp.caldabeast.MagicalCreepers.onCreeperExplode(MagicalCreepers.java:46)
        at sun.reflect.GeneratedMethodAccessor65.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)
        ... 13 more

Please provide any additional information below.
Using Craftbukkit 1.2.5-R1.3 with jre 1.7.0_05. I realize my Craftbukkit is a bit old, but it's provided by Tekkit 3.0.4.