diff --git a/src/pocketmine/block/Solid.php b/src/pocketmine/block/Solid.php
index 10ee27a9fe..587007b0ab 100644
--- a/src/pocketmine/block/Solid.php
+++ b/src/pocketmine/block/Solid.php
@@ -21,12 +21,7 @@
 
 namespace pocketmine\block;
 
-
 abstract class Solid extends Block{
-
-	public function __construct($id, $meta = 0, $name = "Unknown"){
-		parent::__construct($id, $meta, $name);
-		$this->isSolid = true;
-		$this->isFullBlock = true;
-	}
+	public $isSolid = true;
+	public $isFullBlock = true;
 }
\ No newline at end of file
diff --git a/src/pocketmine/level/format/generic/BaseFullChunk.php b/src/pocketmine/level/format/generic/BaseFullChunk.php
index 3e48091f53..14ce8f3e86 100644
--- a/src/pocketmine/level/format/generic/BaseFullChunk.php
+++ b/src/pocketmine/level/format/generic/BaseFullChunk.php
@@ -237,7 +237,10 @@ abstract class BaseFullChunk implements FullChunk{
 
 	public function addTile(Tile $tile){
 		$this->tiles[$tile->getID()] = $tile;
-		$this->tileList[(($tile->z & 0x0f) << 12) | (($tile->x & 0x0f) << 8) | ($tile->y & 0xff)] = $tile;
+		if(isset($this->tileList[$index = (($tile->z & 0x0f) << 12) | (($tile->x & 0x0f) << 8) | ($tile->y & 0xff)]) and $this->tileList[$index] !== $tile){
+			$this->tileList[$index]->close();
+		}
+		$this->tileList[$index] = $tile;
 		$this->hasChanged = true;
 	}