diff --git a/src/pocketmine/level/Level.php b/src/pocketmine/level/Level.php
index d40b5e604..b337b4277 100644
--- a/src/pocketmine/level/Level.php
+++ b/src/pocketmine/level/Level.php
@@ -239,10 +239,8 @@ class Level implements ChunkManager, Metadatable{
 	/** @var int */
 	public $tickRateCounter = 0;
 
-	/** @var Generator */
+	/** @var string|Generator */
 	private $generator;
-	/** @var Generator */
-	private $generatorInstance;
 
 	/** @var bool */
 	private $closed = false;
@@ -379,17 +377,14 @@ class Level implements ChunkManager, Metadatable{
 	}
 
 	public function initLevel(){
-		$generator = $this->generator;
-		$this->generatorInstance = new $generator($this->provider->getGeneratorOptions());
-		$this->generatorInstance->init($this, new Random($this->getSeed()));
-
 		$this->registerGenerator();
 	}
 
 	public function registerGenerator(){
 		$pool = $this->server->getAsyncPool();
 		for($i = 0, $size = $pool->getSize(); $i < $size; ++$i){
-			$pool->submitTaskToWorker(new GeneratorRegisterTask($this, $this->generatorInstance), $i);
+			$pool->submitTaskToWorker(new GeneratorRegisterTask($this, $this->generator, $this->provider->getGeneratorOptions()), $i);
+
 		}
 	}
 
diff --git a/src/pocketmine/level/format/io/BaseLevelProvider.php b/src/pocketmine/level/format/io/BaseLevelProvider.php
index ee1e8fda0..513ee2940 100644
--- a/src/pocketmine/level/format/io/BaseLevelProvider.php
+++ b/src/pocketmine/level/format/io/BaseLevelProvider.php
@@ -60,7 +60,7 @@ abstract class BaseLevelProvider implements LevelProvider{
 
 	protected function fixLevelData() : void{
 		if(!$this->levelData->hasTag("generatorName", StringTag::class)){
-			$this->levelData->setString("generatorName", (string) Generator::getGenerator("DEFAULT"), true);
+			$this->levelData->setString("generatorName", Generator::getGenerator("DEFAULT"), true);
 		}
 
 		if(!$this->levelData->hasTag("generatorOptions", StringTag::class)){
diff --git a/src/pocketmine/level/format/io/leveldb/LevelDB.php b/src/pocketmine/level/format/io/leveldb/LevelDB.php
index ac1334cc0..a63f58a43 100644
--- a/src/pocketmine/level/format/io/leveldb/LevelDB.php
+++ b/src/pocketmine/level/format/io/leveldb/LevelDB.php
@@ -121,7 +121,7 @@ class LevelDB extends BaseLevelProvider{
 			if($this->levelData->hasTag("Generator", IntTag::class)){
 				switch($this->levelData->getInt("Generator")){ //Detect correct generator from MCPE data
 					case self::GENERATOR_FLAT:
-						$this->levelData->setString("generatorName", (string) Generator::getGenerator("FLAT"));
+						$this->levelData->setString("generatorName", Generator::getGenerator("FLAT"));
 						if(($layers = $db->get(self::ENTRY_FLAT_WORLD_LAYERS)) !== false){ //Detect existing custom flat layers
 							$layers = trim($layers, "[]");
 						}else{
@@ -131,7 +131,7 @@ class LevelDB extends BaseLevelProvider{
 						break;
 					case self::GENERATOR_INFINITE:
 						//TODO: add a null generator which does not generate missing chunks (to allow importing back to MCPE and generating more normal terrain without PocketMine messing things up)
-						$this->levelData->setString("generatorName", (string) Generator::getGenerator("DEFAULT"));
+						$this->levelData->setString("generatorName", Generator::getGenerator("DEFAULT"));
 						$this->levelData->setString("generatorOptions", "");
 						break;
 					case self::GENERATOR_LIMITED:
@@ -140,7 +140,7 @@ class LevelDB extends BaseLevelProvider{
 						throw new LevelException("Unknown LevelDB world format type, this level cannot be loaded");
 				}
 			}else{
-				$this->levelData->setString("generatorName", (string) Generator::getGenerator("DEFAULT"));
+				$this->levelData->setString("generatorName", Generator::getGenerator("DEFAULT"));
 			}
 		}
 
diff --git a/src/pocketmine/level/generator/Generator.php b/src/pocketmine/level/generator/Generator.php
index 47427dce4..ad588682c 100644
--- a/src/pocketmine/level/generator/Generator.php
+++ b/src/pocketmine/level/generator/Generator.php
@@ -64,7 +64,7 @@ abstract class Generator{
 	/**
 	 * @param $name
 	 *
-	 * @return Generator
+	 * @return string|Generator Name of class that extends Generator (not an actual Generator object)
 	 */
 	public static function getGenerator($name){
 		if(isset(Generator::$list[$name = strtolower($name)])){
diff --git a/src/pocketmine/level/generator/GeneratorRegisterTask.php b/src/pocketmine/level/generator/GeneratorRegisterTask.php
index 6c7172fe0..1c608a7e1 100644
--- a/src/pocketmine/level/generator/GeneratorRegisterTask.php
+++ b/src/pocketmine/level/generator/GeneratorRegisterTask.php
@@ -32,15 +32,15 @@ use pocketmine\utils\Random;
 
 class GeneratorRegisterTask extends AsyncTask{
 
-	public $generator;
+	public $generatorClass;
 	public $settings;
 	public $seed;
 	public $levelId;
 	public $worldHeight = Level::Y_MAX;
 
-	public function __construct(Level $level, Generator $generator){
-		$this->generator = get_class($generator);
-		$this->settings = serialize($generator->getSettings());
+	public function __construct(Level $level, string $generatorClass, array $generatorSettings = []){
+		$this->generatorClass = $generatorClass;
+		$this->settings = serialize($generatorSettings);
 		$this->seed = $level->getSeed();
 		$this->levelId = $level->getId();
 		$this->worldHeight = $level->getWorldHeight();
@@ -51,9 +51,9 @@ class GeneratorRegisterTask extends AsyncTask{
 		Biome::init();
 		$manager = new SimpleChunkManager($this->seed, $this->worldHeight);
 		$this->saveToThreadStore("generation.level{$this->levelId}.manager", $manager);
+
 		/** @var Generator $generator */
-		$generator = $this->generator;
-		$generator = new $generator(unserialize($this->settings));
+		$generator = new $this->generatorClass(unserialize($this->settings));
 		$generator->init($manager, new Random($manager->getSeed()));
 		$this->saveToThreadStore("generation.level{$this->levelId}.generator", $generator);
 	}
diff --git a/src/pocketmine/scheduler/AsyncWorker.php b/src/pocketmine/scheduler/AsyncWorker.php
index cd9908804..934f457a2 100644
--- a/src/pocketmine/scheduler/AsyncWorker.php
+++ b/src/pocketmine/scheduler/AsyncWorker.php
@@ -33,7 +33,7 @@ class AsyncWorker extends Worker{
 	/** @var int */
 	private $memoryLimit;
 
-	public function __construct(\AttachableThreadedLogger $logger, int $id, int $memoryLimit){
+	public function __construct(\ThreadedLogger $logger, int $id, int $memoryLimit){
 		$this->logger = $logger;
 		$this->id = $id;
 		$this->memoryLimit = $memoryLimit;