This only happens in multiplayer but not singleplayer. Needs fixing either way.

Found by AnotherPlayer#1080.

java.lang.NullPointerException at net.minecraft.item.crafting.Ingredient$TagList.func_199799_a(Ingredient.java:272) at net.minecraft.item.crafting.Ingredient.lambda$new$4(Ingredient.java:47) at net.minecraft.item.crafting.Ingredient$$Lambda$2432/474994030.test(Unknown Source) at java.util.stream.MatchOps$1MatchSink.accept(MatchOps.java:90) at java.util.Spliterators$ArraySpliterator.tryAdvance(Spliterators.java:958) at java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:126) at java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:529) at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:516) at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:502) at java.util.stream.MatchOps$MatchOp.evaluateSequential(MatchOps.java:230) at java.util.stream.MatchOps$MatchOp.evaluateSequential(MatchOps.java:196) at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.util.stream.ReferencePipeline.anyMatch(ReferencePipeline.java:449) at net.minecraft.item.crafting.Ingredient.<init>(Ingredient.java:47) at net.minecraft.item.crafting.Ingredient.func_209357_a(Ingredient.java:153) at com.github.alexthe666.alexsmobs.entity.EntityCapuchinMonkey.<init>(EntityCapuchinMonkey.java:67) at com.github.alexthe666.alexsmobs.entity.AMEntityRegistry$$Lambda$4270/1439934427.create(Unknown Source) at net.minecraft.entity.EntityType.func_200721_a(EntityType.java:445) at com.willr27.blocklings.entity.EntityUtil.init(EntityUtil.java:45) at com.willr27.blocklings.events.ForgeEventBusEvents.onWorldLoad(ForgeEventBusEvents.java:41) at net.minecraftforge.eventbus.ASMEventHandler_768_ForgeEventBusEvents_onWorldLoad_Load.invoke(.dynamic) at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:85) at net.minecraftforge.eventbus.EventBus$$Lambda$2998/1174511944.invoke(Unknown Source) at net.minecraftforge.eventbus.EventBus.post(EventBus.java:302) at net.minecraftforge.eventbus.EventBus.post(EventBus.java:283) at net.minecraft.client.world.ClientWorld.<init>(ClientWorld.java:108) at net.minecraft.client.network.play.ClientPlayNetHandler.func_147282_a(ClientPlayNetHandler.java:375) at net.minecraft.network.play.server.SJoinGamePacket.func_148833_a(SourceFile:110) at net.minecraft.network.play.server.SJoinGamePacket.func_148833_a(SourceFile:18) at net.minecraft.network.PacketThreadUtil.func_225383_a(SourceFile:21) at net.minecraft.network.PacketThreadUtil$$Lambda$15834/1457538170.run(Unknown Source) at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213166_h(SourceFile:144) at net.minecraft.util.concurrent.RecursiveEventLoop.func_213166_h(SourceFile:23) at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213168_p(SourceFile:118) at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213160_bf(SourceFile:103) at net.minecraft.client.Minecraft.func_195542_b(Minecraft.java:948) at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:607) at net.minecraft.client.main.Main.main(Main.java:184) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:51) at net.minecraftforge.fml.loading.FMLClientLaunchProvider$$Lambda$496/818609427.call(Unknown Source) at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) at cpw.mods.modlauncher.Launcher.run(Launcher.java:82) at cpw.mods.modlauncher.Launcher.main(Launcher.java:66)

Might have been fixed by a40afb9 but it needs properly testing.

Closing after testing on a server.