Server crash cancelling EntityMoveHook

[svdragster]

2013-12-13 18:27:27 [SEVERE] Encountered an unexpected exception ReportedException
net.minecraft.server.ReportedException: Ticking entity
at net.minecraft.server.MinecraftServer.t(MinecraftServer.java:510)
at net.minecraft.server.DedicatedServer.t(DedicatedServer.java:204)
at net.minecraft.server.MinecraftServer.s(MinecraftServer.java:432)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:361)
at net.minecraft.server.ThreadMinecraftServer.run(ThreadMinecraftServer.java:13)
Caused by: java.lang.NullPointerException
at net.minecraft.server.Entity.V(Entity.java:1199)
at net.minecraft.server.EntityLivingBase.V(EntityLivingBase.java:1537)
at net.minecraft.server.EntityLivingBase.c(EntityLivingBase.java:1497)
at net.minecraft.server.EntityLiving.c(EntityLiving.java:276)
at net.minecraft.server.EntityAgeable.c(EntityAgeable.java:85)
at net.minecraft.server.EntityLivingBase.l_(EntityLivingBase.java:1280)
at net.minecraft.server.EntityLiving.l_(EntityLiving.java:146)
at net.minecraft.server.World.a(World.java:1335)
at net.minecraft.server.WorldServer.a(WorldServer.java:493)
at net.minecraft.server.World.g(World.java:1315)
at net.minecraft.server.World.h(World.java:1213)
at net.minecraft.server.WorldServer.h(WorldServer.java:363)
at net.minecraft.server.MinecraftServer.t(MinecraftServer.java:505)
... 4 more

public void onEntityMove(EntityMoveHook hook) {
    if (hook.getEntity().getEntityType().equals(EntityType.VILLAGER)) {
            hook.setCanceled();
    }
}