Bukkit

What steps will reproduce the problem?
1. Hitting another player in the Waiting Room or in the arena in BattleArena
2.
3.

What is the expected output? What do you see instead?
No visible error, but console would spam the error below upon each hit.

What version of the product are you using?
2.6

Do you have an error log of what happened?
[SEVERE] Could not pass event EntityDamageByEntityEvent to Random Spawn v2.6
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 org.bukkit.craftbukkit.v1_5_R3.event.CraftEventFactory.callEvent(CraftEventFactory.java:89)
    at org.bukkit.craftbukkit.v1_5_R3.event.CraftEventFactory.callEntityDamageEvent(CraftEventFactory.java:377)
    at org.bukkit.craftbukkit.v1_5_R3.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:402)
    at net.minecraft.server.v1_5_R3.EntityLiving.damageEntity(EntityLiving.java:677)
    at net.minecraft.server.v1_5_R3.EntityHuman.damageEntity(EntityHuman.java:684)
    at net.minecraft.server.v1_5_R3.EntityPlayer.damageEntity(EntityPlayer.java:358)
    at net.minecraft.server.v1_5_R3.EntityHuman.attack(EntityHuman.java:874)
    at net.minecraft.server.v1_5_R3.PlayerConnection.a(PlayerConnection.java:1101)
    at net.minecraft.server.v1_5_R3.Packet7UseEntity.handle(SourceFile:36)
    at net.minecraft.server.v1_5_R3.NetworkManager.b(NetworkManager.java:292)
    at net.minecraft.server.v1_5_R3.PlayerConnection.d(PlayerConnection.java:109)
    at net.minecraft.server.v1_5_R3.ServerConnection.b(SourceFile:35)
    at net.minecraft.server.v1_5_R3.DedicatedServerConnection.b(SourceFile:30)
    at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:581)
    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.IndexOutOfBoundsException: Index: 0, Size: 0
    at java.util.ArrayList.rangeCheck(Unknown Source)
    at java.util.ArrayList.get(Unknown Source)
    at java.util.Collections$UnmodifiableList.get(Unknown Source)
    at me.josvth.randomspawn.listeners.DamageListener.onDamage(DamageListener.java:23)
    at sun.reflect.GeneratedMethodAccessor678.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:425)
    ... 21 more

Please provide any additional information below.
Using BattleArena BattleArena_v3.8.8.2.