[22:02:12] [Server thread/ERROR] [FML/]: An Entity type orangeVillager61.ImprovedVillagers.Entities.IvVillager has thrown an exception trying to write state. It will not persist. Report this to the mod author
net.minecraft.util.ReportedException: Saving entity NBT
	at net.minecraft.entity.Entity.func_189511_e(Entity.java:1728) ~[sn.class:?]
	at net.minecraft.entity.Entity.func_70039_c(Entity.java:1610) ~[sn.class:?]
	at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75820_a(AnvilChunkLoader.java:371) [avd.class:?]
	at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75816_a(AnvilChunkLoader.java:184) [avd.class:?]
	at net.minecraft.world.gen.ChunkProviderServer.func_73242_b(ChunkProviderServer.java:203) [lv.class:?]
	at net.minecraft.world.gen.ChunkProviderServer.func_186027_a(ChunkProviderServer.java:231) [lv.class:?]
	at net.minecraft.world.WorldServer.func_73044_a(WorldServer.java:1015) [lw.class:?]
	at net.minecraft.server.MinecraftServer.func_71267_a(MinecraftServer.java:366) [MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:647) [MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:482) [MinecraftServer.class:?]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_111]
Caused by: java.lang.NullPointerException