From 67fc38f3cdd7827e2bca2f4651cb41f7c35bdb2a Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sat, 16 Jun 2018 16:23:38 -0400
Subject: [PATCH] Ignore Missing Recipes in RecipeBook to avoid data errors

This code was causing NPE's in saving player data, potentially related to reloads.

diff --git a/src/main/java/net/minecraft/server/RecipeBookServer.java b/src/main/java/net/minecraft/server/RecipeBookServer.java
index b0c726be19..34e34b7855 100644
--- a/src/main/java/net/minecraft/server/RecipeBookServer.java
+++ b/src/main/java/net/minecraft/server/RecipeBookServer.java
@@ -65,6 +65,10 @@ public class RecipeBookServer extends RecipeBook {
         NBTTagList nbttaglist = new NBTTagList();
 
         for(MinecraftKey minecraftkey : this.a) {
+            // Paper start - ignore missing recipes
+            IRecipe recipe = this.h.a(minecraftkey);
+            if (recipe == null) continue;
+            // Paper end
             nbttaglist.add((NBTBase)(new NBTTagString(minecraftkey.toString())));
         }
 
@@ -72,6 +76,10 @@ public class RecipeBookServer extends RecipeBook {
         NBTTagList nbttaglist1 = new NBTTagList();
 
         for(MinecraftKey minecraftkey1 : this.b) {
+            // Paper start - ignore missing recipes
+            IRecipe recipe = this.h.a(minecraftkey1);
+            if (recipe == null) continue;
+            // Paper end
             nbttaglist1.add((NBTBase)(new NBTTagString(minecraftkey1.toString())));
         }
 
-- 
2.19.0