Crash no name world

[UnEnanoMas]

Steps to reproduce the error:

1.- /spleef

2.- [New arena]

3.- [New world]

4.- (Do not write anything in the world)

5.- [Send]

Crash:

[14:38:27] [Server thread/CRITICAL]: pocketmine\level\LevelException: "Invalid empty world name" (EXCEPTION) in "src/pocketmine/Server" at line 937
[14:38:27] [Server thread/DEBUG]: #0 plugins/Spleef_dev-3.phar/src/xenialdan/Spleef/Loader(163): pocketmine\Server->loadLevel(string[0] )
[14:38:27] [Server thread/DEBUG]: #1 plugins/Spleef_dev-3.phar/src/xenialdan/Spleef/libs/xenialdan/customui/windows/CustomForm(103): xenialdan\Spleef\Loader->xenialdan\Spleef{closure}(object pocketmine\Player, array[2])
[14:38:27] [Server thread/DEBUG]: #2 src/pocketmine/Player(3588): xenialdan\Spleef\libs\xenialdan\customui\windows\CustomForm->handleResponse(object pocketmine\Player, array[2])
[14:38:27] [Server thread/DEBUG]: #3 src/pocketmine/network/mcpe/PlayerNetworkSessionAdapter(264): pocketmine\Player->onFormSubmit(integer 3, array[2])
[14:38:27] [Server thread/DEBUG]: #4 src/pocketmine/network/mcpe/protocol/ModalFormResponsePacket(49): pocketmine\network\mcpe\PlayerNetworkSessionAdapter->handleModalFormResponse(object pocketmine\network\mcpe\protocol\ModalFormResponsePacket)
[14:38:27] [Server thread/DEBUG]: #5 src/pocketmine/network/mcpe/PlayerNetworkSessionAdapter(110): pocketmine\network\mcpe\protocol\ModalFormResponsePacket->handle(object pocketmine\network\mcpe\PlayerNetworkSessionAdapter)
[14:38:27] [Server thread/DEBUG]: #6 src/pocketmine/network/mcpe/protocol/BatchPacket(127): pocketmine\network\mcpe\PlayerNetworkSessionAdapter->handleDataPacket(object pocketmine\network\mcpe\protocol\ModalFormResponsePacket)
[14:38:27] [Server thread/DEBUG]: #7 src/pocketmine/network/mcpe/PlayerNetworkSessionAdapter(110): pocketmine\network\mcpe\protocol\BatchPacket->handle(object pocketmine\network\mcpe\PlayerNetworkSessionAdapter)
[14:38:27] [Server thread/DEBUG]: #8 src/pocketmine/Player(3235): pocketmine\network\mcpe\PlayerNetworkSessionAdapter->handleDataPacket(object pocketmine\network\mcpe\protocol\BatchPacket)
[14:38:27] [Server thread/DEBUG]: #9 src/pocketmine/network/mcpe/RakLibInterface(169): pocketmine\Player->handleDataPacket(object pocketmine\network\mcpe\protocol\BatchPacket)
[14:38:27] [Server thread/DEBUG]: #10 vendor/pocketmine/raklib/src/server/ServerHandler(99): pocketmine\network\mcpe\RakLibInterface->handleEncapsulated(string[17] 81.0.33.209 33252, object raklib\protocol\EncapsulatedPacket, integer 0)
[14:38:27] [Server thread/DEBUG]: #11 src/pocketmine/network/mcpe/RakLibInterface(109): raklib\server\ServerHandler->handlePacket()
[14:38:27] [Server thread/DEBUG]: #12 src/pocketmine/network/mcpe/RakLibInterface(99): pocketmine\network\mcpe\RakLibInterface->process()
[14:38:27] [Server thread/DEBUG]: #13 vendor/pocketmine/snooze/src/SleeperHandler(123): pocketmine\network\mcpe\RakLibInterface->pocketmine\network\mcpe{closure}()
[14:38:27] [Server thread/DEBUG]: #14 vendor/pocketmine/snooze/src/SleeperHandler(85): pocketmine\snooze\SleeperHandler->processNotifications()
[14:38:27] [Server thread/DEBUG]: #15 src/pocketmine/Server(2157): pocketmine\snooze\SleeperHandler->sleepUntil(double 1593866307.3244)
[14:38:27] [Server thread/DEBUG]: #16 src/pocketmine/Server(1994): pocketmine\Server->tickProcessor()
[14:38:27] [Server thread/DEBUG]: #17 src/pocketmine/Server(1588): pocketmine\Server->start()
[14:38:27] [Server thread/DEBUG]: #18 src/pocketmine/PocketMine(273): pocketmine\Server->__construct(object BaseClassLoader, object pocketmine\utils\MainLogger, string[16] /home/container/, string[24] /home/container/plugins/)
[14:38:27] [Server thread/DEBUG]: #19 src/pocketmine/PocketMine(304): pocketmine\server()
[14:38:27] [Server thread/DEBUG]: #20 (11): require(string[71] phar:///home/container/PocketMine-MP.phar/src/pocketmine/PocketMine.php)

[inxomnyaa]

I was working on adding validation methods to forms in customui 4.0.0-ALPHA. It will take a while until i fix it, thanks for the report