Server crashed and says Internal server error

[JohnnyX071]

So, if i update to the latest version of pocketmine and try to join my server, i join and then i imminently get internal server error this is what i see in console:
[19:24:15] [Server thread/CRITICAL]: TypeError: "Argument 1 passed to pocketmine\network\mcpe\NetworkBinaryStream::putString() must be of the type string, int given, called in phar:///home/container/PocketMine-MP.phar/src/pocketmine/network/mcpe/protocol/AddActorPacket.php on line 211" (EXCEPTION) in "src/pocketmine/network/mcpe/NetworkBinaryStream" at line 62
[19:24:15] [Server thread/DEBUG]: #0 src/pocketmine/network/mcpe/protocol/AddActorPacket(211): pocketmine\network\mcpe\NetworkBinaryStream->putString(integer 33)
[19:24:15] [Server thread/DEBUG]: #1 src/pocketmine/network/mcpe/protocol/DataPacket(127): pocketmine\network\mcpe\protocol\AddActorPacket->encodePayload()
[19:24:15] [Server thread/DEBUG]: #2 src/pocketmine/network/mcpe/RakLibInterface(244): pocketmine\network\mcpe\protocol\DataPacket->encode()
[19:24:15] [Server thread/DEBUG]: #3 src/pocketmine/Player(3235): pocketmine\network\mcpe\RakLibInterface->putPacket(object pocketmine\Player, object pocketmine\network\mcpe\protocol\AddActorPacket, boolean , boolean )
[19:24:15] [Server thread/DEBUG]: #4 src/pocketmine/Player(3252): pocketmine\Player->sendDataPacket(object pocketmine\network\mcpe\protocol\AddActorPacket, boolean , boolean )
[19:24:15] [Server thread/DEBUG]: #5 plugins/Slapper.phar/src/slapper/entities/SlapperEntity(54): pocketmine\Player->dataPacket(object pocketmine\network\mcpe\protocol\AddActorPacket)
[19:24:15] [Server thread/DEBUG]: #6 src/pocketmine/entity/Entity(1945): slapper\entities\SlapperEntity->sendSpawnPacket(object pocketmine\Player)
[19:24:15] [Server thread/DEBUG]: #7 src/pocketmine/Player(1075): pocketmine\entity\Entity->spawnTo(object pocketmine\Player)
[19:24:15] [Server thread/DEBUG]: #8 src/pocketmine/network/mcpe/PlayerNetworkSessionAdapter(315): pocketmine\Player->doFirstSpawn()
[19:24:15] [Server thread/DEBUG]: #9 src/pocketmine/network/mcpe/protocol/SetLocalPlayerAsInitializedPacket(45): pocketmine\network\mcpe\PlayerNetworkSessionAdapter->handleSetLocalPlayerAsInitialized(object pocketmine\network\mcpe\protocol\SetLocalPlayerAsInitializedPacket)
[19:24:15] [Server thread/DEBUG]: #10 src/pocketmine/network/mcpe/PlayerNetworkSessionAdapter(110): pocketmine\network\mcpe\protocol\SetLocalPlayerAsInitializedPacket->handle(object pocketmine\network\mcpe\PlayerNetworkSessionAdapter)
[19:24:15] [Server thread/DEBUG]: #11 src/pocketmine/network/mcpe/protocol/BatchPacket(126): pocketmine\network\mcpe\PlayerNetworkSessionAdapter->handleDataPacket(object pocketmine\network\mcpe\protocol\SetLocalPlayerAsInitializedPacket)
[19:24:15] [Server thread/DEBUG]: #12 src/pocketmine/network/mcpe/PlayerNetworkSessionAdapter(110): pocketmine\network\mcpe\protocol\BatchPacket->handle(object pocketmine\network\mcpe\PlayerNetworkSessionAdapter)
[19:24:15] [Server thread/DEBUG]: #13 src/pocketmine/Player(3187): pocketmine\network\mcpe\PlayerNetworkSessionAdapter->handleDataPacket(object pocketmine\network\mcpe\protocol\BatchPacket)
[19:24:15] [Server thread/DEBUG]: #14 src/pocketmine/network/mcpe/RakLibInterface(169): pocketmine\Player->handleDataPacket(object pocketmine\network\mcpe\protocol\BatchPacket)
[19:24:15] [Server thread/DEBUG]: #15 vendor/pocketmine/raklib/src/server/ServerHandler(99): pocketmine\network\mcpe\RakLibInterface->handleEncapsulated(string[18] 78.87.59.221 54632, object raklib\protocol\EncapsulatedPacket, integer 0)
[19:24:15] [Server thread/DEBUG]: #16 src/pocketmine/network/mcpe/RakLibInterface(109): raklib\server\ServerHandler->handlePacket()
[19:24:15] [Server thread/DEBUG]: #17 src/pocketmine/network/mcpe/RakLibInterface(99): pocketmine\network\mcpe\RakLibInterface->process()
[19:24:15] [Server thread/DEBUG]: #18 vendor/pocketmine/snooze/src/SleeperHandler(123): pocketmine\network\mcpe\RakLibInterface->pocketmine\network\mcpe{closure}()
[19:24:15] [Server thread/DEBUG]: #19 vendor/pocketmine/snooze/src/SleeperHandler(85): pocketmine\snooze\SleeperHandler->processNotifications()
[19:24:15] [Server thread/DEBUG]: #20 src/pocketmine/Server(2154): pocketmine\snooze\SleeperHandler->sleepUntil(double 1591817055.6719)
[19:24:15] [Server thread/DEBUG]: #21 src/pocketmine/Server(1991): pocketmine\Server->tickProcessor()
[19:24:15] [Server thread/DEBUG]: #22 src/pocketmine/Server(1585): pocketmine\Server->start()
[19:24:15] [Server thread/DEBUG]: #23 src/pocketmine/PocketMine(273): pocketmine\Server->__construct(object BaseClassLoader, object pocketmine\utils\MainLogger, string[16] /home/container/, string[24] /home/container/plugins/)
[19:24:15] [Server thread/DEBUG]: #24 src/pocketmine/PocketMine(296): pocketmine\server()
[19:24:15] [Server thread/DEBUG]: #25 (11): require(string[71] phar:///home/container/PocketMine-MP.phar/src/pocketmine/PocketMine.php)

I dont know if its a plugin problem or pocketmine, can you please help me if you know?

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