Disconnected

[LanternServer]

It had been working fine, but when I started a Dragons game, it closed the server. Here's the error message (might be partly other plugins, not very experienced):
[18:53:31] [Server thread/CRITICAL]: #3 pmsrc/src/pocketmine/entity/Entity(1904): pocketmine\event\Event->call()
[18:53:31] [Server thread/CRITICAL]: #4 pmsrc/src/pocketmine/Player(977): pocketmine\entity\Entity->switchLevel(object pocketmine\level\Level)
[18:53:31] [Server thread/CRITICAL]: #5 pmsrc/src/pocketmine/entity/Entity(1769): pocketmine\Player->switchLevel(object pocketmine\level\Level)
[18:53:31] [Server thread/CRITICAL]: #6 pmsrc/src/pocketmine/entity/Entity(1794): pocketmine\entity\Entity->setPosition(object pocketmine\level\Position)
[18:53:31] [Server thread/CRITICAL]: #7 pmsrc/src/pocketmine/entity/Entity(1885): pocketmine\entity\Entity->setPositionAndRotation(object pocketmine\level\Position, double 55.793548583984, double 21.692825317383)
[18:53:31] [Server thread/CRITICAL]: #8 pmsrc/src/pocketmine/Player(3997): pocketmine\entity\Entity->teleport(object pocketmine\level\Position, NULL , NULL )
ing[19] 104.0.125.145 55354, string[17] client disconnect)
[18:53:31] [Server thread/CRITICAL]: #17 pmsrc/src/pocketmine/network/mcpe/RakLibInterface(109): raklib\server\ServerHandler->handlePacket()
[18:53:31] [Server thread/CRITICAL]: #18 pmsrc/src/pocketmine/network/mcpe/RakLibInterface(99): pocketmine\network\mcpe\RakLibInterface->process()
[18:53:31] [Server thread/CRITICAL]: #19 pmsrc/vendor/pocketmine/snooze/src/SleeperHandler(113): pocketmine\network\mcpe\RakLibInterface->pocketmine\network\mcpe{closure}()
[18:53:31] [Server thread/CRITICAL]: #20 pmsrc/vendor/pocketmine/snooze/src/SleeperHandler(75): pocketmine\snooze\SleeperHandler->processNotifications()
[18:53:31] [Server thread/CRITICAL]: #21 pmsrc/src/pocketmine/Server(2155): pocketmine\snooze\SleeperHandler->sleepUntil(double 1626807211.9583)
[18:53:31] [Server thread/CRITICAL]: #22 pmsrc/src/pocketmine/Server(1992): pocketmine\Server->tickProcessor()
[18:53:31] [Server thread/CRITICAL]: #23 pmsrc/src/pocketmine/Server(1586): pocketmine\Server->start()
[18:53:31] [Server thread/CRITICAL]: #24 pmsrc/src/pocketmine/PocketMine(291): pocketmine\Server->__construct(object BaseClassLoader, object pocketmine\utils\MainLogger, string[13] /opt/service/, string[21] /opt/service/plugins/)
[18:53:31] [Server thread/CRITICAL]: #25 pmsrc/src/pocketmine/PocketMine(321): pocketmine\server()
[18:53:31] [Server thread/CRITICAL]: #26 pmsrc(11): require(string[68] phar:///opt/service/PocketMine-MP.phar/src/pocketmine/PocketMine.php)
[18:53:31] [Server thread/EMERGENCY]: An unrecoverable error has occurred and the server has crashed. Creating a crash dump
[18:53:31] [Server thread/EMERGENCY]: Please upload the "/opt/service/crashdumps/Tue_Jul_20-18.53.31-UTC_2021.log" file to the Crash Archive and submit the link to the Bug Reporting page. Give as much info as you can.
[18:53:32] [Server thread/EMERGENCY]: The crash dump has been automatically submitted to the Crash Archive. You can view it on https://crash.pmmp.io/view/5034505 or use the ID #5034505.