papermc/CraftBukkit-Patches/0147-Skip-invalid-enchants-in-CraftMetaItem.patch

From 2417ba6cf39bd3a085012e939030e3c6bcceb101 Mon Sep 17 00:00:00 2001
From: Thinkofdeath <thinkofdeath@spigotmc.org>
Date: Tue, 19 Aug 2014 11:04:21 +0100
Subject: [PATCH] Skip invalid enchants in CraftMetaItem

Its a rare case but when loading a world from a modded server which added enchantments
CraftMetaItem would add a null enchantment into the enchantment map which causes
NullPointers later

diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
index 9a8820b..e57431f 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
@@ -460,7 +460,11 @@ class CraftMetaItem implements ItemMeta, Repairable {
             int id = 0xffff & ((NBTTagCompound) ench.get(i)).getShort(ENCHANTMENTS_ID.NBT);
             int level = 0xffff & ((NBTTagCompound) ench.get(i)).getShort(ENCHANTMENTS_LVL.NBT);
 
-            enchantments.put(Enchantment.getById(id), level);
+            // Spigot start - skip invalid enchantments
+            Enchantment e = Enchantment.getById(id);
+            if (e == null) continue;
+            // Spigot end
+            enchantments.put(e, level);
         }
 
         return enchantments;
-- 
2.1.4