error

16:06:39 [SEVERE] Could not pass event EntityDamageByEntityEvent to OtherDrops v2.8-beta5.1.1
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.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
        at net.minecraft.server.v1_4_R1.Explosion.a(Explosion.java:167)
        at net.minecraft.server.v1_4_R1.World.createExplosion(World.java:1608)
        at net.minecraft.server.v1_4_R1.WorldServer.createExplosion(WorldServer.java:773)
        at net.minecraft.server.v1_4_R1.EntityTNTPrimed.explode(EntityTNTPrimed.java:81)
        at net.minecraft.server.v1_4_R1.EntityTNTPrimed.j_(EntityTNTPrimed.java:61)
        at net.minecraft.server.v1_4_R1.World.entityJoinedWorld(World.java:1332)
        at net.minecraft.server.v1_4_R1.WorldServer.entityJoinedWorld(WorldServer.java:548)
        at net.minecraft.server.v1_4_R1.World.playerJoinedWorld(World.java:1313)
        at net.minecraft.server.v1_4_R1.World.tickEntities(World.java:1191)
        at net.minecraft.server.v1_4_R1.WorldServer.tickEntities(WorldServer.java:445)
        at net.minecraft.server.v1_4_R1.MinecraftServer.r(MinecraftServer.java:580)
        at net.minecraft.server.v1_4_R1.DedicatedServer.r(DedicatedServer.java:224)
        at net.minecraft.server.v1_4_R1.MinecraftServer.q(MinecraftServer.java:494)
        at net.minecraft.server.v1_4_R1.MinecraftServer.run(MinecraftServer.java:427)
        at net.minecraft.server.v1_4_R1.ThreadServerApplication.run(SourceFile:849)
Caused by: java.lang.NullPointerException
        at com.gmail.zariust.otherdrops.event.OccurredEvent.<init>(OccurredEvent.java:161)
        at com.gmail.zariust.otherdrops.listener.OdEntityListener.onEntityDamage(OdEntityListener.java:59)
        at sun.reflect.GeneratedMethodAccessor745.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:601)
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
        ... 18 more