Safe-Creeper Error log

15:05:05 [SEVERE] Could not pass event ProjectileLaunchEvent to SafeCreeper v1.4.2
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
        at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:35)
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
        at org.bukkit.craftbukkit.v1_5_R3.event.CraftEventFactory.callProjectileLaunchEvent(CraftEventFactory.java:574)
        at net.minecraft.server.v1_5_R3.World.addEntity(World.java:929)
        at net.minecraft.server.v1_5_R3.World.addEntity(World.java:896)
        at net.minecraft.server.v1_5_R3.DispenseBehaviorProjectile.b(DispenseBehaviorProjectile.java:47)
        at net.minecraft.server.v1_5_R3.DispenseBehaviorItem.a(DispenseBehaviorItem.java:13)
        at net.minecraft.server.v1_5_R3.BlockDispenser.dispense(BlockDispenser.java:82)
        at net.minecraft.server.v1_5_R3.BlockDispenser.a(BlockDispenser.java:110)
        at net.minecraft.server.v1_5_R3.WorldServer.a(WorldServer.java:532)
        at net.minecraft.server.v1_5_R3.WorldServer.doTick(WorldServer.java:200)
        at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:555)
        at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:226)
        at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:477)
        at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:410)
        at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.NullPointerException