My bukkit server keeps slowing down, this is my error.

Hi, I am xpaintall! I am posting here again. Now this time i keep getting this error:

java.lang.NullPointerException
at net.minecraft.server.v1_8_R3.NetworkManager.close(NetworkManager.java:245) ~[server.jar:git-Spigot-db6de12-18fbb24]
at net.minecraft.server.v1_8_R3.NetworkManager.channelInactive(NetworkManager.java:105) ~[server.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:233) [server.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:219) [server.jar:git-Spigot-db6de12-18fbb24]
at io.netty.handler.codec.ByteToMessageDecoder.channelInactive(ByteToMessageDecoder.java:228) [server.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:233) [server.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:219) [server.jar:git-Spigot-db6de12-18fbb24]
at io.netty.handler.codec.ByteToMessageDecoder.channelInactive(ByteToMessageDecoder.java:228) [server.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:233) [server.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:219) [server.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.ChannelInboundHandlerAdapter.channelInactive(ChannelInboundHandlerAdapter.java:75) [server.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:233) [server.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:219) [server.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.ChannelInboundHandlerAdapter.channelInactive(ChannelInboundHandlerAdapter.java:75) [server.jar:git-Spigot-db6de12-18fbb24]
at io.netty.handler.timeout.ReadTimeoutHandler.channelInactive(ReadTimeoutHandler.java:144) [server.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:233) [server.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:219) [server.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.DefaultChannelPipeline.fireChannelInactive(DefaultChannelPipeline.java:769) [server.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.AbstractChannel$AbstractUnsafe$5.run(AbstractChannel.java:567) [server.jar:git-Spigot-db6de12-18fbb24]
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:380) [server.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:357) [server.jar:git-Spigot-db6de12-18fbb24]
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116) [server.jar:git-Spigot-db6de12-18fbb24]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_261]



Now you see, I have made progress and I don't want to lose it, ofc, but i think it is coming from the lobby coz i made a server, got this error, made another server and keep getting this error again.
I don't want to throw my lobby away, just coz i spent about 40 hrs on it.


Please help!

 

https://pastebin.com/uLq9WJYL @timtower

 

@timtower https://pastebin.com/yPumCp5d I think this is the full log.
Is there any way i can recover my world coz i haven't made any backups.