Bukkit

Error log. Is it compatible with plugin MyPet ?

2013-12-01 01:36:49 [SEVERE] Could not pass event VehicleEnterEvent to MyHorse v0.2.2
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 net.minecraft.server.v1_6_R3.Entity.setPassengerOf(Entity.java:1452)
    at net.minecraft.server.v1_6_R3.EntityHuman.setPassengerOf(EntityHuman.java:332)
    at net.minecraft.server.v1_6_R3.EntityPlayer.setPassengerOf(EntityPlayer.java:495)
    at net.minecraft.server.v1_6_R3.EntityPlayer.mount(EntityPlayer.java:487)
    at net.minecraft.server.v1_6_R3.EntityHorse.h(EntityHorse.java:664)
    at net.minecraft.server.v1_6_R3.EntityHorse.a(EntityHorse.java:649)
    at net.minecraft.server.v1_6_R3.EntityInsentient.c(EntityInsentient.java:812)
    at net.minecraft.server.v1_6_R3.EntityHuman.p(EntityHuman.java:815)
    at net.minecraft.server.v1_6_R3.PlayerConnection.a(PlayerConnection.java:1144)
    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.NullPointerException
    at com.dogonfire.myhorse.EventListener.onVehicleEnter(EventListener.java:287)
    at sun.reflect.GeneratedMethodAccessor318.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)
    ... 23 more