From 5011c4049d2d9d65d19fd159a63811744bfb7ddb Mon Sep 17 00:00:00 2001
From: Byteflux <byte@byteflux.net>
Date: Tue, 1 Mar 2016 15:08:03 -0600
Subject: [PATCH] Remove invalid mob spawner tile entities


diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
index eca1284cc..0a436133a 100644
--- a/src/main/java/net/minecraft/server/Chunk.java
+++ b/src/main/java/net/minecraft/server/Chunk.java
@@ -797,6 +797,10 @@ public class Chunk implements IChunkAccess {
             tileentity.z();
             this.tileEntities.put(blockposition.h(), tileentity);
             // CraftBukkit start
+            // Paper start - Remove invalid mob spawner tile entities
+        } else if (tileentity instanceof TileEntityMobSpawner && !(getBlockData(blockposition.getX(), blockposition.getY(), blockposition.getZ()).getBlock() instanceof BlockMobSpawner)) {
+            this.tileEntities.remove(blockposition);
+            // Paper end
         } else {
             System.out.println("Attempted to place a tile entity (" + tileentity + ") at " + tileentity.position.getX() + "," + tileentity.position.getY() + "," + tileentity.position.getZ()
                 + " (" + getType(blockposition) + ") where there was no entity tile!");
-- 
2.20.1