diff --git a/src/pocketmine/level/format/anvil/ChunkSection.php b/src/pocketmine/level/format/anvil/ChunkSection.php
index 44f1bd2e9..dba61776c 100644
--- a/src/pocketmine/level/format/anvil/ChunkSection.php
+++ b/src/pocketmine/level/format/anvil/ChunkSection.php
@@ -149,7 +149,7 @@ class ChunkSection implements \pocketmine\level\format\ChunkSection{
 		$i = ($z << 3) + ($x >> 1);
 		$column = "";
 		for($y = 0; $y < 16; $y += 2){
-			$column .= ($this->data{($y << 7) + $i} & "\x0f") | ($this->data{(($y + 1) << 7) + $i} & "\xf0");
+			$column .= chr((ord($this->data{($y << 7) + $i}) & 0x0f) | ((ord($this->data{(($y + 1) << 7) + $i}) & 0x0f) << 4));
 		}
 
 		return $column;
@@ -159,7 +159,7 @@ class ChunkSection implements \pocketmine\level\format\ChunkSection{
 		$i = ($z << 3) + ($x >> 1);
 		$column = "";
 		for($y = 0; $y < 16; $y += 2){
-			$column .= ($this->skyLight{($y << 7) + $i} & "\x0f") | ($this->skyLight{(($y + 1) << 7) + $i} & "\xf0");
+			$column .= chr((ord($this->skyLight{($y << 7) + $i}) & 0x0f) | ((ord($this->skyLight{(($y + 1) << 7) + $i}) & 0x0f) << 4));
 		}
 
 		return $column;
@@ -169,7 +169,7 @@ class ChunkSection implements \pocketmine\level\format\ChunkSection{
 		$i = ($z << 3) + ($x >> 1);
 		$column = "";
 		for($y = 0; $y < 16; $y += 2){
-			$column .= ($this->blockLight{($y << 7) + $i} & "\x0f") | ($this->blockLight{(($y + 1) << 7) + $i} & "\xf0");
+			$column .= chr((ord($this->blockLight{($y << 7) + $i}) & 0x0f) | ((ord($this->blockLight{(($y + 1) << 7) + $i}) & 0x0f) << 4));
 		}
 
 		return $column;
diff --git a/src/pocketmine/metadata/BlockMetadataStore.php b/src/pocketmine/metadata/BlockMetadataStore.php
index e4a917e45..f4d03c387 100644
--- a/src/pocketmine/metadata/BlockMetadataStore.php
+++ b/src/pocketmine/metadata/BlockMetadataStore.php
@@ -41,7 +41,10 @@ class BlockMetadataStore extends MetadataStore{
 		return $block->x . ":" . $block->y . ":" . $block->z . ":" . $metadataKey;
 	}
 
-	public function getMetadata(Block $block, $metadataKey){
+	public function getMetadata($block, $metadataKey){
+		if($block instanceof Block){
+			throw new \Exception("Object must be a Block");
+		}
 		if($block->getLevel() === $this->owningLevel){
 			return parent::getMetadata($block, $metadataKey);
 		}else{
@@ -49,7 +52,10 @@ class BlockMetadataStore extends MetadataStore{
 		}
 	}
 
-	public function hasMetadata(Block $block, $metadataKey){
+	public function hasMetadata($block, $metadataKey){
+		if($block instanceof Block){
+			throw new \Exception("Object must be a Block");
+		}
 		if($block->getLevel() === $this->owningLevel){
 			return parent::hasMetadata($block, $metadataKey);
 		}else{
@@ -57,7 +63,10 @@ class BlockMetadataStore extends MetadataStore{
 		}
 	}
 
-	public function removeMetadata(Block $block, $metadataKey, Plugin $owningPlugin){
+	public function removeMetadata($block, $metadataKey, Plugin $owningPlugin){
+		if($block instanceof Block){
+			throw new \Exception("Object must be a Block");
+		}
 		if($block->getLevel() === $this->owningLevel){
 			parent::hasMetadata($block, $metadataKey, $owningPlugin);
 		}else{
@@ -65,7 +74,10 @@ class BlockMetadataStore extends MetadataStore{
 		}
 	}
 
-	public function setMetadata(Block $block, $metadataKey, MetadataValue $newMetadatavalue){
+	public function setMetadata($block, $metadataKey, MetadataValue $newMetadatavalue){
+		if($block instanceof Block){
+			throw new \Exception("Object must be a Block");
+		}
 		if($block->getLevel() === $this->owningLevel){
 			parent::setMetadata($block, $metadataKey, $newMetadatavalue);
 		}else{