[22:44:14 ERROR]: Could not pass event EntityDamageByEntityEvent to Practice v1.0
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:292) ~[custom.jar:1.8.8]
        at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78) ~[custom.jar:1.8.8]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:88) ~[custom.jar:1.8.8]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:507) ~[custom.jar:1.8.8]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:492) ~[custom.jar:1.8.8]
        at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callEvent(CraftEventFactory.java:74) ~[custom.jar:1.8.8]
        at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callEntityDamageEvent(CraftEventFactory.java:544) ~[custom.jar:1.8.8]
        at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:457) ~[custom.jar:1.8.8]
        at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.handleLivingEntityDamageEvent(CraftEventFactory.java:576) ~[custom.jar:1.8.8]
        at net.minecraft.server.v1_8_R3.EntityLiving.d(EntityLiving.java:1144) ~[custom.jar:1.8.8]
        at net.minecraft.server.v1_8_R3.EntityHuman.d(EntityHuman.java:860) ~[custom.jar:1.8.8]
        at net.minecraft.server.v1_8_R3.EntityLiving.damageEntity(EntityLiving.java:777) ~[custom.jar:1.8.8]
        at net.minecraft.server.v1_8_R3.EntityHuman.damageEntity(EntityHuman.java:801) ~[custom.jar:1.8.8]
        at net.minecraft.server.v1_8_R3.EntityPlayer.damageEntity(EntityPlayer.java:514) ~[custom.jar:1.8.8]
        at net.minecraft.server.v1_8_R3.EntityHuman.attack(EntityHuman.java:1016) ~[custom.jar:1.8.8]
        at net.minecraft.server.v1_8_R3.EntityPlayer.attack(EntityPlayer.java:1096) ~[custom.jar:1.8.8]
        at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1385) ~[custom.jar:1.8.8]
        at net.minecraft.server.v1_8_R3.PacketPlayInUseEntity.a(PacketPlayInUseEntity.java:36) ~[custom.jar:1.8.8]
        at net.minecraft.server.v1_8_R3.PacketPlayInUseEntity.a(PacketPlayInUseEntity.java:7) ~[custom.jar:1.8.8]
        at net.minecraft.server.v1_8_R3.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:6) ~[custom.jar:1.8.8]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_212]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_212]
        at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) ~[custom.jar:1.8.8]
        at net.minecraft.server.v1_8_R3.MinecraftServer.lambda$startTickloop$1(MinecraftServer.java:598) ~[custom.jar:1.8.8]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_212]
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) [?:1.8.0_212]
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) [?:1.8.0_212]
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) [?:1.8.0_212]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_212]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_212]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_212]
Caused by: java.lang.NullPointerException
        at ga.strikepractice.fights.FightsListener.onDamage(FightsListener.java:106) ~[?:?]
        at sun.reflect.GeneratedMethodAccessor38.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_212]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_212]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:290) ~[custom.jar:1.8.8]
        ... 30 more