[SEVERE] Could not pass event EntityDamageByEntityEvent to ItemLoreStats v0.8
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:30)
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:478)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:463)
	at org.bukkit.craftbukkit.v1_6_R3.event.CraftEventFactory.callEvent(CraftEventFactory.java:94)
	at org.bukkit.craftbukkit.v1_6_R3.event.CraftEventFactory.callEntityDamageEvent(CraftEventFactory.java:398)
	at org.bukkit.craftbukkit.v1_6_R3.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:423)
	at net.minecraft.server.v1_6_R3.EntityLiving.damageEntity(EntityLiving.java:644)
	at net.minecraft.server.v1_6_R3.EntityHuman.damageEntity(EntityHuman.java:719)
	at net.minecraft.server.v1_6_R3.EntityPlayer.damageEntity(EntityPlayer.java:399)
	at net.minecraft.server.v1_6_R3.EntityHuman.attack(EntityHuman.java:889)
	at net.minecraft.server.v1_6_R3.PlayerConnection.a(PlayerConnection.java:1158)
	at net.minecraft.server.v1_6_R3.Packet7UseEntity.handle(SourceFile:36)
	at org.spigotmc.netty.NettyNetworkManager.b(NettyNetworkManager.java:230)
	at net.minecraft.server.v1_6_R3.PlayerConnection.e(PlayerConnection.java:117)
	at net.minecraft.server.v1_6_R3.ServerConnection.b(SourceFile:37)
	at org.spigotmc.netty.NettyServerConnection.b(NettyServerConnection.java:132)
	at net.minecraft.server.v1_6_R3.MinecraftServer.t(MinecraftServer.java:594)
	at net.minecraft.server.v1_6_R3.DedicatedServer.t(DedicatedServer.java:240)
	at net.minecraft.server.v1_6_R3.MinecraftServer.s(MinecraftServer.java:483)
	at net.minecraft.server.v1_6_R3.MinecraftServer.run(MinecraftServer.java:415)
	at net.minecraft.server.v1_6_R3.ThreadServerApplication.run(SourceFile:583)
Caused by: java.lang.NumberFormatException: empty String
	at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1011)
	at java.lang.Double.parseDouble(Double.java:540)
	at com.github.supavitax.itemlorestats.DamageSystem.attackerDamage(DamageSystem.java:76)
	at com.github.supavitax.itemlorestats.DamageSystem.onEntityDamage(DamageSystem.java:22)
	at sun.reflect.GeneratedMethodAccessor236.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
	... 22 more
2013-11-08 00:25:35 [SEVERE] Could not pass event EntityDamageByEntityEvent to ItemLoreStats v0.8
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:30)
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:478)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:463)
	at org.bukkit.craftbukkit.v1_6_R3.event.CraftEventFactory.callEvent(CraftEventFactory.java:94)
	at org.bukkit.craftbukkit.v1_6_R3.event.CraftEventFactory.callEntityDamageEvent(CraftEventFactory.java:398)
	at org.bukkit.craftbukkit.v1_6_R3.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:423)
	at net.minecraft.server.v1_6_R3.EntityLiving.damageEntity(EntityLiving.java:644)
	at net.minecraft.server.v1_6_R3.EntityHuman.damageEntity(EntityHuman.java:719)
	at net.minecraft.server.v1_6_R3.EntityPlayer.damageEntity(EntityPlayer.java:399)
	at net.minecraft.server.v1_6_R3.EntityHuman.attack(EntityHuman.java:889)
	at net.minecraft.server.v1_6_R3.PlayerConnection.a(PlayerConnection.java:1158)
	at net.minecraft.server.v1_6_R3.Packet7UseEntity.handle(SourceFile:36)
	at org.spigotmc.netty.NettyNetworkManager.b(NettyNetworkManager.java:230)
	at net.minecraft.server.v1_6_R3.PlayerConnection.e(PlayerConnection.java:117)
	at net.minecraft.server.v1_6_R3.ServerConnection.b(SourceFile:37)
	at org.spigotmc.netty.NettyServerConnection.b(NettyServerConnection.java:132)
	at net.minecraft.server.v1_6_R3.MinecraftServer.t(MinecraftServer.java:594)
	at net.minecraft.server.v1_6_R3.DedicatedServer.t(DedicatedServer.java:240)
	at net.minecraft.server.v1_6_R3.MinecraftServer.s(MinecraftServer.java:483)
	at net.minecraft.server.v1_6_R3.MinecraftServer.run(MinecraftServer.java:415)
	at net.minecraft.server.v1_6_R3.ThreadServerApplication.run(SourceFile:583)
Caused by: java.lang.NumberFormatException: empty String
	at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1011)
	at java.lang.Double.parseDouble(Double.java:540)
	at com.github.supavitax.itemlorestats.DamageSystem.attackerDamage(DamageSystem.java:76)
	at com.github.supavitax.itemlorestats.DamageSystem.onEntityDamage(DamageSystem.java:22)
	at sun.reflect.GeneratedMethodAccessor236.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
	... 22 more