Help please :)

[WoollenPanda275]

Hi sorry to bother you but i keep on getting this error and i also get kicked off the server whenever i remove a slapper. Its not just me that has this issue as some of my friends are having the same problem. Is there a quick way to fix this or is it a bug with slapper?

[00:27:26] [Server thread/CRITICAL]: pocketmine\utils\AssumptionFailedError: "Position world is null" (EXCEPTION) in "src/pocketmine/level/Position" at line 83
[00:27:26] [Server thread/DEBUG]: #0 src/pocketmine/event/entity/EntityDamageByEntityEvent(65): pocketmine\level\Position->getLevelNonNull()
[00:27:26] [Server thread/DEBUG]: #1 plugins/TempBanUI.phar/src/SonsaYT/TempBanUI/Main(108): pocketmine\event\entity\EntityDamageByEntityEvent->getDamager()
[00:27:26] [Server thread/DEBUG]: #2 src/pocketmine/plugin/MethodEventExecutor(42): SonsaYT\TempBanUI\Main->hitBan(object pocketmine\event\entity\EntityDamageByEntityEvent)
[00:27:26] [Server thread/DEBUG]: #3 src/pocketmine/plugin/RegisteredListener(80): pocketmine\plugin\MethodEventExecutor->execute(object SonsaYT\TempBanUI\Main, object pocketmine\event\entity\EntityDamageByEntityEvent)
[00:27:26] [Server thread/DEBUG]: #4 src/pocketmine/event/Event(88): pocketmine\plugin\RegisteredListener->callEvent(object pocketmine\event\entity\EntityDamageByEntityEvent)
[00:27:26] [Server thread/DEBUG]: #5 src/pocketmine/entity/Entity(932): pocketmine\event\Event->call()
[00:27:26] [Server thread/DEBUG]: #6 src/pocketmine/entity/Living(546): pocketmine\entity\Entity->attack(object pocketmine\event\entity\EntityDamageByEntityEvent)
[00:27:26] [Server thread/DEBUG]: #7 src/pocketmine/Player(2685): pocketmine\entity\Living->attack(object pocketmine\event\entity\EntityDamageByEntityEvent)
[00:27:26] [Server thread/DEBUG]: #8 src/pocketmine/network/mcpe/PlayerNetworkSessionAdapter(150): pocketmine\Player->handleInventoryTransaction(object pocketmine\network\mcpe\protocol\InventoryTransactionPacket)
[00:27:26] [Server thread/DEBUG]: #9 src/pocketmine/network/mcpe/protocol/InventoryTransactionPacket(173): pocketmine\network\mcpe\PlayerNetworkSessionAdapter->handleInventoryTransaction(object pocketmine\network\mcpe\protocol\InventoryTransactionPacket)
[00:27:26] [Server thread/DEBUG]: #10 src/pocketmine/network/mcpe/PlayerNetworkSessionAdapter(110): pocketmine\network\mcpe\protocol\InventoryTransactionPacket->handle(object pocketmine\network\mcpe\PlayerNetworkSessionAdapter)
[00:27:26] [Server thread/DEBUG]: #11 src/pocketmine/network/mcpe/protocol/BatchPacket(127): pocketmine\network\mcpe\PlayerNetworkSessionAdapter->handleDataPacket(object pocketmine\network\mcpe\protocol\InventoryTransactionPacket)
[00:27:26] [Server thread/DEBUG]: #12 src/pocketmine/network/mcpe/PlayerNetworkSessionAdapter(110): pocketmine\network\mcpe\protocol\BatchPacket->handle(object pocketmine\network\mcpe\PlayerNetworkSessionAdapter)
[00:27:26] [Server thread/DEBUG]: #13 src/pocketmine/Player(3247): pocketmine\network\mcpe\PlayerNetworkSessionAdapter->handleDataPacket(object pocketmine\network\mcpe\protocol\BatchPacket)
[00:27:26] [Server thread/DEBUG]: #14 src/pocketmine/network/mcpe/RakLibInterface(169): pocketmine\Player->handleDataPacket(object pocketmine\network\mcpe\protocol\BatchPacket)
[00:27:26] [Server thread/DEBUG]: #15 vendor/pocketmine/raklib/src/server/ServerHandler(99): pocketmine\network\mcpe\RakLibInterface->handleEncapsulated(string[17] 192.168.0.5 58491, object raklib\protocol\EncapsulatedPacket, integer 0)
[00:27:26] [Server thread/DEBUG]: #16 src/pocketmine/network/mcpe/RakLibInterface(109): raklib\server\ServerHandler->handlePacket()
[00:27:26] [Server thread/DEBUG]: #17 src/pocketmine/network/mcpe/RakLibInterface(99): pocketmine\network\mcpe\RakLibInterface->process()
[00:27:26] [Server thread/DEBUG]: #18 vendor/pocketmine/snooze/src/SleeperHandler(123): pocketmine\network\mcpe\RakLibInterface->pocketmine\network\mcpe{closure}()
[00:27:26] [Server thread/DEBUG]: #19 vendor/pocketmine/snooze/src/SleeperHandler(85): pocketmine\snooze\SleeperHandler->processNotifications()
[00:27:26] [Server thread/DEBUG]: #20 src/pocketmine/Server(2157): pocketmine\snooze\SleeperHandler->sleepUntil(double 1594596446.0992)
[00:27:26] [Server thread/DEBUG]: #21 src/pocketmine/Server(1994): pocketmine\Server->tickProcessor()
[00:27:26] [Server thread/DEBUG]: #22 src/pocketmine/Server(1588): pocketmine\Server->start()