diff --git a/src/inventory/transaction/CraftingTransaction.php b/src/inventory/transaction/CraftingTransaction.php
index c7f71723f..5a36061f7 100644
--- a/src/inventory/transaction/CraftingTransaction.php
+++ b/src/inventory/transaction/CraftingTransaction.php
@@ -48,8 +48,8 @@ use function intdiv;
  * results, with no remainder. Any leftovers are expected to be emitted back to the crafting grid.
  */
 class CraftingTransaction extends InventoryTransaction{
-	protected ?CraftingRecipe $recipe;
-	protected ?int $repetitions;
+	protected ?CraftingRecipe $recipe = null;
+	protected ?int $repetitions = null;
 
 	/** @var Item[] */
 	protected array $inputs = [];
diff --git a/src/thread/CommonThreadPartsTrait.php b/src/thread/CommonThreadPartsTrait.php
index 8085cf8d6..283d4ea39 100644
--- a/src/thread/CommonThreadPartsTrait.php
+++ b/src/thread/CommonThreadPartsTrait.php
@@ -30,7 +30,7 @@ use function error_reporting;
 trait CommonThreadPartsTrait{
 	/** @var \Threaded|\ClassLoader[]|null  */
 	private ?\Threaded $classLoaders = null;
-	protected ?string $composerAutoloaderPath;
+	protected ?string $composerAutoloaderPath = null;
 
 	protected bool $isKilled = false;
 
diff --git a/src/world/utils/SubChunkExplorer.php b/src/world/utils/SubChunkExplorer.php
index d4275e951..97ba3cff5 100644
--- a/src/world/utils/SubChunkExplorer.php
+++ b/src/world/utils/SubChunkExplorer.php
@@ -28,8 +28,8 @@ use pocketmine\world\format\Chunk;
 use pocketmine\world\format\SubChunk;
 
 class SubChunkExplorer{
-	public ?Chunk $currentChunk;
-	public ?SubChunk $currentSubChunk;
+	public ?Chunk $currentChunk = null;
+	public ?SubChunk $currentSubChunk = null;
 
 	protected int $currentX;
 	protected int $currentY;