this is what the console says:
[13:44:03] [Render thread/INFO]: Connecting to 10.10.10.20, 25565
[13:44:03] [Server Connector #10/INFO]: Protocol version forced to 757 (1.18)
[13:44:04] [Render thread/INFO]: Started 1 worker threads
[13:44:04] [Render thread/INFO]: Environment: authHost='https://authserver.mojang.com', accountsHost='https://api.mojang.com', sessionHost='https://sessionserver.mojang.com', servicesHost='https://api.minecraftservices.com', name='PROD'
[13:44:04] [Render thread/INFO]: Loaded 238 advancements
[13:44:08] [Netty Epoll Client IO #1/ERROR]: !!!!!!!! Unexpected disconnect, please upload this error to https://github.com/Earthcomputer/multiconnect/issues !!!!!!!!
[13:44:08] [Netty Epoll Client IO #1/ERROR]: It may be helpful if you also provide the server IP, but you are not obliged to do this.
[13:44:08] [Netty Epoll Client IO #1/ERROR]: Minecraft version: 1.18
[13:44:08] [Netty Epoll Client IO #1/ERROR]: multiconnect version: 1.5.1
[13:44:08] [Netty Epoll Client IO #1/ERROR]: Server version: 757 (1.18)
[13:44:08] [Netty Epoll Client IO #1/ERROR]: Server brand: fabric
[13:44:08] [Netty Epoll Client IO #1/ERROR]: Compressed packet data: H4sIAAAAAAAA/+P6/+88A8PsgAJxBgCKhnSpCwAAAA==
[13:44:08] [Netty Epoll Client IO #1/ERROR]: Unexpectedly disconnected from server!
io.netty.handler.codec.DecoderException: java.lang.NullPointerException: Cannot invoke "net.minecraft.class_2487.method_10582(String, String)" because "this.field_12039" is null
at Not Enough Crashes deobfuscated stack trace.(1.18+build.1) ~[?:?]
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:280) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:324) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:296) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:324) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:296) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:286) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:795) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:480) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:378) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [netty-all-4.1.68.Final.jar:4.1.68.Final]
at java.lang.Thread.run(Thread.java:833) [?:?]
Caused by: java.lang.NullPointerException: Cannot invoke "net.minecraft.class_2487.method_10582(String, String)" because "this.field_12039" is null
at net.minecraft.network.packet.s2c.play.BlockEntityUpdateS2CPacket.handler$znc000$onRead(BlockEntityUpdateS2CPacket:532) ~[?:?]
at net.minecraft.network.packet.s2c.play.BlockEntityUpdateS2CPacket.(BlockEntityUpdateS2CPacket:38) ~[?:?]
at net.minecraft.network.NetworkState$PacketHandler.createPacket(NetworkState:417) ~[?:?]
at net.minecraft.network.NetworkState.getPacketHandler(NetworkState:469) ~[?:?]
at net.minecraft.network.DecoderHandler.decode(DecoderHandler:36) ~[?:?]
at net.minecraft.network.DecoderHandler.callDecode(DecoderHandler) ~[?:?]
at net.earthcomputer.multiconnect.impl.DebugUtils$DebugDecoderHandler.decode(DebugUtils.java:301) ~[multiconnect-1.5.1.jar:?]
at net.minecraft.network.DecoderHandler.callDecode(DecoderHandler) ~[?:?]
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
... 31 more
[13:44:08] [Render thread/INFO]: Stopping worker threads