diff --git a/src/pocketmine/block/Block.php b/src/pocketmine/block/Block.php
index 0ed6eb803..3fee8b260 100644
--- a/src/pocketmine/block/Block.php
+++ b/src/pocketmine/block/Block.php
@@ -763,7 +763,7 @@ class Block extends Position implements BlockIds, Metadatable{
 			return $this->level->getBlockMetadata()->getMetadata($this, $metadataKey);
 		}
 
-		return null;
+		return [];
 	}
 
 	public function hasMetadata(string $metadataKey) : bool{