diff --git a/composer.lock b/composer.lock
index eda54ceca..77276aac6 100644
--- a/composer.lock
+++ b/composer.lock
@@ -437,12 +437,12 @@
             "source": {
                 "type": "git",
                 "url": "https://github.com/pmmp/NBT.git",
-                "reference": "b4746c1d3c0f465dc4406754018f96b113ec4170"
+                "reference": "221212bd1991430a74374295261795a9a13875bb"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/pmmp/NBT/zipball/b4746c1d3c0f465dc4406754018f96b113ec4170",
-                "reference": "b4746c1d3c0f465dc4406754018f96b113ec4170",
+                "url": "https://api.github.com/repos/pmmp/NBT/zipball/221212bd1991430a74374295261795a9a13875bb",
+                "reference": "221212bd1991430a74374295261795a9a13875bb",
                 "shasum": ""
             },
             "require": {
@@ -470,7 +470,7 @@
                 "source": "https://github.com/pmmp/NBT/tree/master",
                 "issues": "https://github.com/pmmp/NBT/issues"
             },
-            "time": "2019-11-29T21:29:01+00:00"
+            "time": "2019-12-09T11:21:10+00:00"
         },
         {
             "name": "pocketmine/raklib",
diff --git a/src/Server.php b/src/Server.php
index 0cdb5ec8c..bb0f07ee9 100644
--- a/src/Server.php
+++ b/src/Server.php
@@ -614,7 +614,7 @@ class Server{
 
 		if(file_exists($path . "$name.dat")){
 			try{
-				return (new BigEndianNbtSerializer())->readCompressed(file_get_contents($path . "$name.dat"))->getTag();
+				return (new BigEndianNbtSerializer())->readCompressed(file_get_contents($path . "$name.dat"))->mustGetCompoundTag();
 			}catch(NbtDataException $e){ //zlib decode error / corrupt data
 				rename($path . "$name.dat", $path . "$name.dat.bak");
 				$this->logger->error($this->getLanguage()->translateString("pocketmine.data.playerCorrupted", [$name]));
diff --git a/src/network/mcpe/handler/InGamePacketHandler.php b/src/network/mcpe/handler/InGamePacketHandler.php
index f45cdab1e..a69d3f7bf 100644
--- a/src/network/mcpe/handler/InGamePacketHandler.php
+++ b/src/network/mcpe/handler/InGamePacketHandler.php
@@ -518,7 +518,7 @@ class InGamePacketHandler extends PacketHandler{
 		$block = $this->player->getLocation()->getWorld()->getBlock($pos);
 		try{
 			$offset = 0;
-			$nbt = (new NetworkNbtSerializer())->read($packet->namedtag, $offset, 512)->getTag();
+			$nbt = (new NetworkNbtSerializer())->read($packet->namedtag, $offset, 512)->mustGetCompoundTag();
 		}catch(NbtDataException $e){
 			throw new BadPacketException($e->getMessage(), 0, $e);
 		}
diff --git a/src/network/mcpe/serializer/NetworkBinaryStream.php b/src/network/mcpe/serializer/NetworkBinaryStream.php
index 27b4c5153..aca0d1b75 100644
--- a/src/network/mcpe/serializer/NetworkBinaryStream.php
+++ b/src/network/mcpe/serializer/NetworkBinaryStream.php
@@ -120,7 +120,7 @@ class NetworkBinaryStream extends BinaryStream{
 				throw new BadPacketException("Unexpected NBT count $c");
 			}
 			try{
-				$compound = (new NetworkNbtSerializer())->read($this->buffer, $this->offset, 512)->getTag();
+				$compound = (new NetworkNbtSerializer())->read($this->buffer, $this->offset, 512)->mustGetCompoundTag();
 			}catch(NbtDataException $e){
 				throw new BadPacketException($e->getMessage(), 0, $e);
 			}
diff --git a/src/world/format/io/data/BedrockWorldData.php b/src/world/format/io/data/BedrockWorldData.php
index 6e04c434d..a20dd2cc4 100644
--- a/src/world/format/io/data/BedrockWorldData.php
+++ b/src/world/format/io/data/BedrockWorldData.php
@@ -108,7 +108,7 @@ class BedrockWorldData extends BaseNbtWorldData{
 	protected function load() : CompoundTag{
 		$nbt = new LittleEndianNbtSerializer();
 		try{
-			$worldData = $nbt->read(substr(file_get_contents($this->dataPath), 8))->getTag();
+			$worldData = $nbt->read(substr(file_get_contents($this->dataPath), 8))->mustGetCompoundTag();
 		}catch(NbtDataException $e){
 			throw new CorruptedWorldException($e->getMessage(), 0, $e);
 		}
diff --git a/src/world/format/io/data/JavaWorldData.php b/src/world/format/io/data/JavaWorldData.php
index 2b142a648..f3b509604 100644
--- a/src/world/format/io/data/JavaWorldData.php
+++ b/src/world/format/io/data/JavaWorldData.php
@@ -72,7 +72,7 @@ class JavaWorldData extends BaseNbtWorldData{
 	protected function load() : CompoundTag{
 		$nbt = new BigEndianNbtSerializer();
 		try{
-			$worldData = $nbt->readCompressed(file_get_contents($this->dataPath))->getTag();
+			$worldData = $nbt->readCompressed(file_get_contents($this->dataPath))->mustGetCompoundTag();
 		}catch(NbtDataException $e){
 			throw new CorruptedWorldException($e->getMessage(), 0, $e);
 		}
diff --git a/src/world/format/io/leveldb/LevelDB.php b/src/world/format/io/leveldb/LevelDB.php
index 0c7c06db3..96690ae0d 100644
--- a/src/world/format/io/leveldb/LevelDB.php
+++ b/src/world/format/io/leveldb/LevelDB.php
@@ -172,7 +172,7 @@ class LevelDB extends BaseWorldProvider implements WritableWorldProvider{
 		$palette = [];
 		for($i = 0, $paletteSize = $stream->getLInt(); $i < $paletteSize; ++$i){
 			$offset = $stream->getOffset();
-			$tag = $nbt->read($stream->getBuffer(), $offset)->getTag();
+			$tag = $nbt->read($stream->getBuffer(), $offset)->mustGetCompoundTag();
 			$stream->setOffset($offset);
 
 			$id = $stringToLegacyId[$tag->getString("name")] ?? BlockLegacyIds::INFO_UPDATE;
@@ -392,7 +392,7 @@ class LevelDB extends BaseWorldProvider implements WritableWorldProvider{
 		$entities = [];
 		if(($entityData = $this->db->get($index . self::TAG_ENTITY)) !== false and $entityData !== ""){
 			try{
-				$entities = array_map(function(TreeRoot $root) : CompoundTag{ return $root->getTag(); }, $nbt->readMultiple($entityData));
+				$entities = array_map(function(TreeRoot $root) : CompoundTag{ return $root->mustGetCompoundTag(); }, $nbt->readMultiple($entityData));
 			}catch(NbtDataException $e){
 				throw new CorruptedChunkException($e->getMessage(), 0, $e);
 			}
@@ -402,7 +402,7 @@ class LevelDB extends BaseWorldProvider implements WritableWorldProvider{
 		$tiles = [];
 		if(($tileData = $this->db->get($index . self::TAG_BLOCK_ENTITY)) !== false and $tileData !== ""){
 			try{
-				$tiles = array_map(function(TreeRoot $root) : CompoundTag{ return $root->getTag(); }, $nbt->readMultiple($tileData));
+				$tiles = array_map(function(TreeRoot $root) : CompoundTag{ return $root->mustGetCompoundTag(); }, $nbt->readMultiple($tileData));
 			}catch(NbtDataException $e){
 				throw new CorruptedChunkException($e->getMessage(), 0, $e);
 			}
diff --git a/src/world/format/io/region/LegacyAnvilChunkTrait.php b/src/world/format/io/region/LegacyAnvilChunkTrait.php
index 18ae27719..0266c0bb1 100644
--- a/src/world/format/io/region/LegacyAnvilChunkTrait.php
+++ b/src/world/format/io/region/LegacyAnvilChunkTrait.php
@@ -57,7 +57,7 @@ trait LegacyAnvilChunkTrait{
 	protected function deserializeChunk(string $data) : Chunk{
 		$nbt = new BigEndianNbtSerializer();
 		try{
-			$chunk = $nbt->readCompressed($data)->getTag();
+			$chunk = $nbt->readCompressed($data)->mustGetCompoundTag();
 		}catch(NbtDataException $e){
 			throw new CorruptedChunkException($e->getMessage(), 0, $e);
 		}
diff --git a/src/world/format/io/region/McRegion.php b/src/world/format/io/region/McRegion.php
index a695a3372..34e18cfad 100644
--- a/src/world/format/io/region/McRegion.php
+++ b/src/world/format/io/region/McRegion.php
@@ -57,7 +57,7 @@ class McRegion extends RegionWorldProvider{
 	protected function deserializeChunk(string $data) : Chunk{
 		$nbt = new BigEndianNbtSerializer();
 		try{
-			$chunk = $nbt->readCompressed($data)->getTag();
+			$chunk = $nbt->readCompressed($data)->mustGetCompoundTag();
 		}catch(NbtDataException $e){
 			throw new CorruptedChunkException($e->getMessage(), 0, $e);
 		}