Server Crash....

[EinBexiii]

Description:
When I join the Server Crashes...

CrashDump:
Error: Argument 1 passed to pocketmine\utils\BinaryStream::putString() must be of the type string, null given, called in /home/Lobby2/src/pocketmine/network/mcpe/protocol/AddPlayerPacket.php on line 72
File: /src/pocketmine/utils/BinaryStream
Line: 267
Type: notice

Code:
[258] $this->buffer .= Binary::writeLLong($v);
[259] }
[260]
[261]
[262] public function getString(): string
[263] {
[264] return $this->get($this->getUnsignedVarInt());
[265] }
[266]
[267] public function putString(string $v)
[268] {
[269] $this->putUnsignedVarInt(strlen($v));
[270] $this->put($v);
[271] }
[272]
[273]
[274] public function getUUID(): UUID
[275] {
[276] //This is actually two little-endian longs: UUID Most followed by UUID Least
[277] $part1 = $this->getLInt();

Backtrace:
#0 /src/pocketmine/network/mcpe/protocol/AddPlayerPacket(72): pocketmine\utils\BinaryStream->putString(NULL )
#1 /src/pocketmine/network/mcpe/RakLibInterface(213): pocketmine\network\mcpe\protocol\AddPlayerPacket->encode()
#2 /src/pocketmine/Player(1211): pocketmine\network\mcpe\RakLibInterface->putPacket(pocketmine\Player object, pocketmine\network\mcpe\protocol\AddPlayerPacket object, boolean , boolean )
#3 /src/pocketmine/entity/Wolf(56): pocketmine\Player->dataPacket(pocketmine\network\mcpe\protocol\AddPlayerPacket object)
#4 /src/pocketmine/Player(1039): pocketmine\entity\Wolf->spawnTo(pocketmine\Player object)
#5 /src/pocketmine/Player(953): pocketmine\Player->doFirstSpawn()
#6 /src/pocketmine/level/Level(2940): pocketmine\Player->sendChunk(integer 310, integer 315, pocketmine\network\mcpe\protocol\BatchPacket object)
#7 /src/pocketmine/level/format/io/ChunkRequestTask(96): pocketmine\level\Level->chunkRequestCallback(integer 310, integer 315, pocketmine\network\mcpe\protocol\BatchPacket object)
#8 /src/pocketmine/scheduler/AsyncPool(170): pocketmine\level\format\io\ChunkRequestTask->onCompletion(pocketmine\Server object)
#9 /src/pocketmine/scheduler/ServerScheduler(367): pocketmine\scheduler\AsyncPool->collectTasks()
#10 /src/pocketmine/Server(2676): pocketmine\scheduler\ServerScheduler->mainThreadHeartbeat(integer 144)
#11 /src/pocketmine/Server(2427): pocketmine\Server->tick()
#12 /src/pocketmine/Server(2303): pocketmine\Server->tickProcessor()
#13 /src/pocketmine/Server(1835): pocketmine\Server->start()
#14 /src/pocketmine/PocketMine(506): pocketmine\Server->__construct(BaseClassLoader object, pocketmine\utils\MainLogger object, string /home/Lobby2/, string /home/Lobby2/, string /home/Lobby2/plugins/)

Leveryl version: 1.0 #0 [Protocol 113; API 3.0.0-ALPHA5]
Git commit: 0000000000000000000000000000000000000000
uname -a: Linux srv47067host-unlimitedde 2.6.32-openvz-042stab123.2-amd64 #1 SMP Mon Apr 17 17:29:21 MSK 2017 x86_64
PHP Version: 7.0.3
Zend version: 3.0.0
OS : Linux, linux

Loaded plugins:
NoVoid 0.3 by rirititi for API(s) 1.0.0
LobbySystemMG 2 by for API(s) 2.0.0, 3.0.0-ALPHA6, 3.0.0-ALPHA7, 3.0.0-ALPHA8, 3.0.0-ALPHA9, 3.0.0-ALPHA10, 3.0.0-ALPHA11, 4.0.0
BauServerCloud 1 by for API(s) 3.0.0
BexCheat 1 by Bexiii for API(s) 3.0.0
MagicWE 0.2.4 by thebigsmileXD for API(s) 3.0.0, 3.0.0-ALPHA6
Rang 1.5.1 by KCodeYT for API(s) 1.14.0
RefreshQSG 1 by for API(s) 3.0.0
Screenbox 1 by KCodeYT for API(s) 3.0.0
Chest 1 by for API(s) 3.0.0
ClearLagg 1.1.0 by LegendOfMCPE for API(s) 1.0.0
WorldFixer 1 by CreeperFace for API(s) 3.0.0-ALPHA6
BanSystem 2 by for API(s) 3.0.0
RefreshQSGTwo 1 by for API(s) 3.0.0

[EinBexiii]

Fixed?