From 65ce1a75810b89f1e692facbcf76fff4841fe7c7 Mon Sep 17 00:00:00 2001
From: "Dylan K. Taylor" <odigiman@gmail.com>
Date: Fri, 15 Feb 2019 13:37:57 +0000
Subject: [PATCH] Block: fixed correct-type tiles getting overwritten this
 manifested by crashing the server whenever someone used a furnace.

---
 src/pocketmine/block/Block.php | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/pocketmine/block/Block.php b/src/pocketmine/block/Block.php
index e290d6c4f..4a8dff988 100644
--- a/src/pocketmine/block/Block.php
+++ b/src/pocketmine/block/Block.php
@@ -189,8 +189,9 @@ class Block extends Position implements BlockIds, Metadatable{
 		$oldTile = $this->level->getTile($this);
 		if($oldTile !== null and ($tileType === null or !($oldTile instanceof $tileType))){
 			$oldTile->close();
+			$oldTile = null;
 		}
-		if($tileType !== null){
+		if($oldTile === null and $tileType !== null){
 			$this->level->addTile(TileFactory::create($tileType, $this->level, $this->asVector3()));
 		}
 	}