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			throw new \InvalidArgumentException("Cannot serialize a null itemstack");
		}
		if($item instanceof ItemBlock){
			$data = $this->serializeBlockItem($item->getBlock());
		}else{
			$index = $item->getTypeId();

			$locatedSerializer = $this->itemSerializers[$index] ?? null;
			if($locatedSerializer === null){
				throw new ItemTypeSerializeException("No serializer registered for " . get_class($item) . " ($index) " . $item->getName());
			}

			/**
			 * TODO: there is no guarantee that this type actually matches that of $item - a plugin may have stolen
			 * the type ID of the item (which never makes sense, even in a world where overriding item types is a thing).
			 * In the future we'll need some way to guarantee that type IDs are never reused (perhaps spl_object_id()?)
			 *
			 * @var \Closure $serializer
			 * @phpstan-var \Closure(TItemType) : Data $serializer
			 */

#0 pmsrc/src/data/bedrock/item/ItemSerializer(140): pocketmine\data\bedrock\item\ItemSerializer->serializeType(object pocketmine\item\Item#870999, null)
#1 pmsrc/src/item/Item(733): pocketmine\data\bedrock\item\ItemSerializer->serializeStack(object pocketmine\item\Item#870999, int 12)
#2 pmsrc/src/block/tile/ContainerTrait(75): pocketmine\item\Item->nbtSerialize(int 12)
#3 pmsrc/src/block/tile/Chest(83): pocketmine\block\tile\Chest->saveItems(object pocketmine\nbt\tag\CompoundTag#1080325)
#4 pmsrc/src/block/tile/Tile(77): pocketmine\block\tile\Chest->writeSaveData(object pocketmine\nbt\tag\CompoundTag#1080325)
#5 pmsrc/src/world/World(3049): pocketmine\block\tile\Tile->saveNBT()
#6 (): pocketmine\world\World->pocketmine\world\{closure}(object pocketmine\block\tile\Chest#747911)
#7 pmsrc/src/world/World(3049): array_map(object Closure#1544416, array[19])
#8 pmsrc/src/world/World(3571): pocketmine\world\World->unloadChunk(int -119, int 44, true)
#9 pmsrc/src/world/World(1017): pocketmine\world\World->unloadChunks()
#10 pmsrc/src/world/World(992): pocketmine\world\World->actuallyDoTick(int 32918)
#11 pmsrc/src/world/WorldManager(351): pocketmine\world\World->doTick(int 32918)
#12 pmsrc/src/Server(1891): pocketmine\world\WorldManager->tick(int 32918)
#13 pmsrc/src/Server(1773): pocketmine\Server->tick()
#14 pmsrc/src/Server(1096): pocketmine\Server->tickProcessor()
#15 pmsrc/src/PocketMine(341): pocketmine\Server->__construct(object pocketmine\thread\ThreadSafeClassLoader#3, object pocketmine\utils\MainLogger#6, string[24] /home/anmine/servers/s1/, string[32] /home/anmine/servers/s1/plugins/)
#16 pmsrc/src/PocketMine(364): pocketmine\server()
#17 pmsrc(11): require(string[61] phar:///home/anmine/servers/s1/InCore.phar/src/PocketMine.php)