[17:18:00] [Server thread/ERROR]: Could not pass event PlayerItemHeldEvent to MobRider v0.47.4-SNAPSHOT-b208
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427) ~[spigot.jar:git-Spigot-1204]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-1204]
at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:30) ~[spigot.jar:git-Spigot-1204]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:482) [spigot.jar:git-Spigot-1204]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:467) [spigot.jar:git-Spigot-1204]
at net.minecraft.server.v1_7_R1.PlayerConnection.a(PlayerConnection.java:751) [spigot.jar:git-Spigot-1204]
at net.minecraft.server.v1_7_R1.PacketPlayInHeldItemSlot.a(SourceFile:30) [spigot.jar:git-Spigot-1204]
at net.minecraft.server.v1_7_R1.PacketPlayInHeldItemSlot.handle(SourceFile:8) [spigot.jar:git-Spigot-1204]
at net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:147) [spigot.jar:git-Spigot-1204]
at net.minecraft.server.v1_7_R1.ServerConnection.c(SourceFile:134) [spigot.jar:git-Spigot-1204]
at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:657) [spigot.jar:git-Spigot-1204]
at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:259) [spigot.jar:git-Spigot-1204]
at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:540) [spigot.jar:git-Spigot-1204]
at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:446) [spigot.jar:git-Spigot-1204]
at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617) [spigot.jar:git-Spigot-1204]
Caused by: java.lang.NullPointerException
at com.edwardhand.mobrider.commons.MessageUtils.sendMessage(MessageUtils.java:45) ~[?:?]
at com.edwardhand.mobrider.goals.GoalManager.setStopGoal(GoalManager.java:88) ~[?:?]
at com.edwardhand.mobrider.rider.RiderManager.addRider(RiderManager.java:111) ~[?:?]
at com.edwardhand.mobrider.rider.RiderManager.isRider(RiderManager.java:185) ~[?:?]
at com.edwardhand.mobrider.listeners.RiderPlayerListener.onItemHeldChange(RiderPlayerListener.java:109) ~[?:?]
at sun.reflect.GeneratedMethodAccessor706.invoke(Unknown Source) ~[?:?]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_03]
at java.lang.reflect.Method.invoke(Method.java:601) ~[?:1.7.0_03]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425) ~[spigot.jar:git-Spigot-1204]
... 14 more