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java.lang.NullPointerException: 	at me.blackvein.quests.Quester.killMob(Quester.java:1104)	at me.blackvein.quests.PlayerListener.onEntityDeath(PlayerListener.java:711)	at sun.reflect.GeneratedMethodAccessor184.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306)	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502)	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487)	at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callEntityDeathEvent(CraftEventFactory.java:378)	at net.minecraft.server.v1_8_R3.EntityLiving.die(EntityLiving.java:874)	at net.minecraft.server.v1_8_R3.EntityLiving.damageEntity(EntityLiving.java:812)	at net.minecraft.server.v1_8_R3.EntityMonster.damageEntity(EntityMonster.java:42)	at net.minecraft.server.v1_8_R3.EntityEnderman.damageEntity(EntityEnderman.java:294)	at net.minecraft.server.v1_8_R3.EntityHuman.attack(EntityHuman.java:1001)	at net.minecraft.server.v1_8_R3.EntityPlayer.attack(EntityPlayer.java:1063)	at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1355)	at net.minecraft.server.v1_8_R3.PacketPlayInUseEntity.a(SourceFile:52)	at net.minecraft.server.v1_8_R3.PacketPlayInUseEntity.a(SourceFile:11)	at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44)	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715)	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374)	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654)	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557)	at java.lang.Thread.run(Thread.java:745)