Crash on connection

[Darkilen]

Describe the bug
When a user try to connect to Bungee, he's disconnected right away with an error.

To Reproduce
Connect to a bungee server

Expected behavior
Connection successfull

Screenshots or log
Logs are censored for privacy reasons (username, uuid and IP/port)
11:30:42 [INFO] [BungeePerms] Login by username (uuid) 11:30:42 [WARNING] Plugin listener net.alpenblock.bungeeperms.platform.bungee.BungeeEventListener took 104ms to process event LoginEvent(cancelled=false, reason=null, connection=[username,/IP:PORT] <-> InitialHandler)! 11:30:42 [INFO] [username] <-> ServerConnector [hub] has connected 11:30:44 [INFO] [/IP:PORT] <-> InitialHandler has pinged 11:30:44 [WARNING] [username] <-> DownstreamBridge <-> [hub] - could not decode packet! io.netty.handler.codec.DecoderException: java.lang.IllegalArgumentException: Unknown string key at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:101) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412) at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:107) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412) at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:346) at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:333) at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:455) at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:290) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412) at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1357) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:440) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:868) at io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:799) at io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:501) at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:399) at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) at java.base/java.lang.Thread.run(Thread.java:1583) Caused by: java.lang.IllegalArgumentException: Unknown string key at com.google.common.base.Preconditions.checkArgument(Preconditions.java:218) at net.md_5.bungee.protocol.DefinedPacket.readStringMapKey(DefinedPacket.java:77) at net.md_5.bungee.protocol.packet.Team.read(Team.java:77) at net.md_5.bungee.protocol.DefinedPacket.read(DefinedPacket.java:534) at net.md_5.bungee.protocol.MinecraftDecoder.decode(MinecraftDecoder.java:42) at net.md_5.bungee.protocol.MinecraftDecoder.decode(MinecraftDecoder.java:11) at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:91) ... 24 more 11:30:44 [INFO] [username] disconnected with: §f§fDecoderException : java.lang.IllegalArgumentException: Unknown string key @ io.netty.handler.codec.MessageToMessageDecoder:101 11:30:44 [INFO] [username] -> UpstreamBridge has disconnected

Additional context
We juste updated Bungee to latest (build 1900 from SpigotMC/BungeeCord@22aa6f5)