diff --git a/src/pocketmine/block/BlockFactory.php b/src/pocketmine/block/BlockFactory.php
index 9276e3f74..f65538279 100644
--- a/src/pocketmine/block/BlockFactory.php
+++ b/src/pocketmine/block/BlockFactory.php
@@ -330,6 +330,10 @@ class BlockFactory{
 		}
 	}
 
+	public static function isInit() : bool{
+		return self::$fullList !== null;
+	}
+
 	/**
 	 * Registers a block type into the index. Plugins may use this method to register new block types or override
 	 * existing ones.
diff --git a/src/pocketmine/level/light/LightPopulationTask.php b/src/pocketmine/level/light/LightPopulationTask.php
index 201d52d41..6a7ab7a85 100644
--- a/src/pocketmine/level/light/LightPopulationTask.php
+++ b/src/pocketmine/level/light/LightPopulationTask.php
@@ -23,6 +23,7 @@ declare(strict_types=1);
 
 namespace pocketmine\level\light;
 
+use pocketmine\block\BlockFactory;
 use pocketmine\level\format\Chunk;
 use pocketmine\level\Level;
 use pocketmine\scheduler\AsyncTask;
@@ -39,6 +40,9 @@ class LightPopulationTask extends AsyncTask{
 	}
 
 	public function onRun(){
+		if(!BlockFactory::isInit()){
+			BlockFactory::init();
+		}
 		/** @var Chunk $chunk */
 		$chunk = Chunk::fastDeserialize($this->chunk);