diff --git a/src/pocketmine/block/Fence.php b/src/pocketmine/block/Fence.php
index d0480cf70..a706ea796 100644
--- a/src/pocketmine/block/Fence.php
+++ b/src/pocketmine/block/Fence.php
@@ -57,11 +57,9 @@ class Fence extends Transparent{
 			self::FENCE_BIRCH => "Birch Fence",
 			self::FENCE_JUNGLE => "Jungle Fence",
 			self::FENCE_ACACIA => "Acacia Fence",
-			self::FENCE_DARKOAK => "Dark Oak Fence",
-			"",
-			""
+			self::FENCE_DARKOAK => "Dark Oak Fence"
 		];
-		return $names[$this->meta & 0x07];
+		return $names[$this->meta & 0x07] ?? "Unknown";
 	}
 
 	protected function recalculateBoundingBox(){
diff --git a/src/pocketmine/block/Planks.php b/src/pocketmine/block/Planks.php
index 850b56bb7..96237aec7 100644
--- a/src/pocketmine/block/Planks.php
+++ b/src/pocketmine/block/Planks.php
@@ -54,11 +54,9 @@ class Planks extends Solid{
 			self::BIRCH => "Birch Wood Planks",
 			self::JUNGLE => "Jungle Wood Planks",
 			self::ACACIA => "Acacia Wood Planks",
-			self::DARK_OAK => "Dark Oak Wood Planks",
-			"",
-			""
+			self::DARK_OAK => "Dark Oak Wood Planks"
 		];
-		return $names[$this->meta & 0x07];
+		return $names[$this->meta & 0x07] ?? "Unknown";
 	}
 
 }