diff --git a/src/pocketmine/Player.php b/src/pocketmine/Player.php
index f7323ae3c..8cf780211 100644
--- a/src/pocketmine/Player.php
+++ b/src/pocketmine/Player.php
@@ -2629,7 +2629,7 @@ class Player extends Human implements CommandSender, InventoryHolder, ChunkLoade
 							TextFormat::clean($nbt["Text1"], $this->removeFormat), TextFormat::clean($nbt["Text2"], $this->removeFormat), TextFormat::clean($nbt["Text3"], $this->removeFormat), TextFormat::clean($nbt["Text4"], $this->removeFormat)
 						]);
 
-						if(!isset($t->namedtag->Creator) or $t->namedtag["Creator"] !== $this->username){
+						if(!isset($t->namedtag->Creator) or $t->namedtag["Creator"] !== $this->getUniqueId()){
 							$ev->setCancelled(true);
 						}
 
diff --git a/src/pocketmine/PocketMine.php b/src/pocketmine/PocketMine.php
index bccadd718..7fecf35ac 100644
--- a/src/pocketmine/PocketMine.php
+++ b/src/pocketmine/PocketMine.php
@@ -74,8 +74,8 @@ namespace pocketmine {
 	const VERSION = "1.5dev";
 	const API_VERSION = "1.12.0";
 	const CODENAME = "活発(Kappatsu)フグ(Fugu)";
-	const MINECRAFT_VERSION = "v0.11.0 alpha build 13";
-	const MINECRAFT_VERSION_NETWORK = "0.11.0.13";
+	const MINECRAFT_VERSION = "v0.11.0 alpha";
+	const MINECRAFT_VERSION_NETWORK = "0.11.0";
 
 	/*
 	 * Startup code. Do not look at it, it may harm you.
diff --git a/src/pocketmine/level/Level.php b/src/pocketmine/level/Level.php
index d90ac95ea..476e46593 100644
--- a/src/pocketmine/level/Level.php
+++ b/src/pocketmine/level/Level.php
@@ -1621,7 +1621,7 @@ class Level implements ChunkManager, Metadatable{
 				"Text4" => new String("Text4", "")
 			]));
 			if($player instanceof Player){
-				$tile->namedtag->Creator = new String("Creator", $player->getName());
+				$tile->namedtag->Creator = new String("Creator", $player->getUniqueId());
 			}
 		}
 		$item->setCount($item->getCount() - 1);