diff --git a/src/pocketmine/tile/Chest.php b/src/pocketmine/tile/Chest.php
index 8d6abae94..3bffa58d6 100644
--- a/src/pocketmine/tile/Chest.php
+++ b/src/pocketmine/tile/Chest.php
@@ -63,6 +63,10 @@ class Chest extends Spawnable implements InventoryHolder, Container, Nameable{
 			foreach($this->getInventory()->getViewers() as $player){
 				$player->removeWindow($this->getRealInventory());
 			}
+
+			$this->inventory = null;
+			$this->doubleInventory = null;
+
 			parent::close();
 		}
 	}
diff --git a/src/pocketmine/tile/Furnace.php b/src/pocketmine/tile/Furnace.php
index b97b95adb..637acee47 100644
--- a/src/pocketmine/tile/Furnace.php
+++ b/src/pocketmine/tile/Furnace.php
@@ -92,6 +92,9 @@ class Furnace extends Spawnable implements InventoryHolder, Container, Nameable{
 			foreach($this->getInventory()->getViewers() as $player){
 				$player->removeWindow($this->getInventory());
 			}
+
+			$this->inventory = null;
+
 			parent::close();
 		}
 	}