Paper/CraftBukkit-Patches/0023-Detect-remove-and-warn-about-null-tile-entities.patch

From df7aaaaa25ae229a755ffadd32308cab505e3313 Mon Sep 17 00:00:00 2001
From: md_5 <md_5@live.com.au>
Date: Sun, 3 Feb 2013 09:20:19 +1100
Subject: [PATCH] Detect, remove and warn about null tile entities.

---
 src/main/java/net/minecraft/server/World.java | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 5cf6bc6..4b6c910 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -1332,6 +1332,13 @@ public abstract class World implements IBlockAccess {
 
         while (iterator.hasNext()) {
             TileEntity tileentity = (TileEntity) iterator.next();
+            // Spigot start
+            if (tileentity == null) {
+                getServer().getLogger().severe("Spigot has detected a null entity and has removed it, preventing a crash");
+                iterator.remove();
+                continue;
+            }
+            // Spigot end
             // CraftBukkit start - don't tick entities in chunks queued for unload
             ChunkProviderServer chunkProviderServer = ((WorldServer) this).chunkProviderServer;
             if (chunkProviderServer.unloadQueue.contains(tileentity.x >> 4, tileentity.z >> 4)) {
-- 
1.8.1-rc2