Modded Minecraft Forge 1.7.10 client crashes sometimes after joining my server

Forge: 1.7.10 - 10.13.4.1558

Launcher: Magic Launcher

Custom arguments: -XX:+UseG1GC -XX:ParallelGCThreads=8 -XX:MaxGCPauseMillis=200 -XX:+UseCompressedOops -XX:InitiatingHeapOccupancyPercent=70 -Dfml.ignoreInvalidMinecraftCertificates=true -Dfml.ignorePatchDiscrepancies=true

Allocated Memory: 2 GB

Intro

Hi guys!

I have a really weird error for a while now and I want to know the reason for it. So I use a client with a lot of mods and configured a Forge Server for myself. The map of the Server is a very old map that my friends and I play for years now. I recently ported the map from 1.6.4.

Error

Sometimes if I want to join the server the client will crash. I am able to join, I will then see and empty world with or without some entities and the game will crash then. The server will also show an error, but I guess that this is nothing special. The crash is very weird, because most times I will be able to join the server successful if I load Minecraft again. I noticed that this crash will occur more likely in areas where we built something (speaking of midtown). If I join the server and my character is in an unpopulated area, the client will not crash most times. Most times means that it can occur, but there is no guarantee that it will happen and I am very thankful for that, because if you try it again and again you will be able to join the server successful.

Logs

• fml-client-latest.log:
  https://gist.github.com/ErikSteiner/5ca2ad3261ef1cac48a4aed685110349
  
• server log:
   
  04.04.2016 08:56:59 [Netty IO #2/INFO] [FML] Client protocol version 2
  04.04.2016 08:56:59 [Netty IO #2/INFO] [FML] Client attempting to join with 42 mods : [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected]_dev_r8
  04.04.2016 08:56:59 [Netty IO #2/INFO] [FML] Attempting connection with missing mods [Dynmap, ForgeEssentials, Morpheus, WorldBorder, worldedit] at CLIENT
  04.04.2016 08:56:59 [iNFO] [FML] [server thread] Server side modded connection established
  04.04.2016 08:56:59 [iNFO] Erik_Steiner[/127.0.0.1:59997] logged in with entity id 673 at (6.921244507251931, 86.66465859869241, -11.510433434373532)
  04.04.2016 08:56:59 [iNFO] Erik_Steiner joined the game
  04.04.2016 08:57:00 [Playerlogger/WARN] [FML] =============================================================
  04.04.2016 08:57:00 [Playerlogger/WARN] [FML] MOD HAS DIRECT REFERENCE System.exit() THIS IS NOT ALLOWED REROUTING TO FML!
  04.04.2016 08:57:00 [Playerlogger/WARN] [FML] Offendor: antlr/Parser.panic()V
  04.04.2016 08:57:00 [Playerlogger/WARN] [FML] Use FMLCommonHandler.exitJava instead
  04.04.2016 08:57:00 [Playerlogger/WARN] [FML] =============================================================
  04.04.2016 08:57:12 [Netty IO #2/ERROR] [FML] NetworkDispatcher exception
  04.04.2016 08:57:12 java.io.IOException: Eine vorhandene Verbindung wurde vom Remotehost geschlossen
  04.04.2016 08:57:12 at sun.nio.ch.SocketDispatcher.read0(Native Method) ~[?:1.8.0_73]
  04.04.2016 08:57:12 at sun.nio.ch.SocketDispatcher.read(Unknown Source) ~[?:1.8.0_73]
  04.04.2016 08:57:12 at sun.nio.ch.IOUtil.readIntoNativeBuffer(Unknown Source) ~[?:1.8.0_73]
  04.04.2016 08:57:12 at sun.nio.ch.IOUtil.read(Unknown Source) ~[?:1.8.0_73]
  04.04.2016 08:57:12 at sun.nio.ch.SocketChannelImpl.read(Unknown Source) ~[?:1.8.0_73]
  04.04.2016 08:57:12 at io.netty.buffer.UnpooledUnsafeDirectByteBuf.setBytes(UnpooledUnsafeDirectByteBuf.java:436) ~[unpooledUnsafeDirectByteBuf.class:?]
  04.04.2016 08:57:12 at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:870) ~[AbstractByteBuf.class:?]
  04.04.2016 08:57:12 at io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:208) ~[NioSocketChannel.class:?]
  04.04.2016 08:57:12 at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:87) [AbstractNioByteChannel$NioByteUnsafe.class:?]
  04.04.2016 08:57:12 at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:480) [NioEventLoop.class:?]
  04.04.2016 08:57:12 at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:447) [NioEventLoop.class:?]
  04.04.2016 08:57:12 at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:341) [NioEventLoop.class:?]
  04.04.2016 08:57:12 at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101) [singleThreadEventExecutor$2.class:?]
  04.04.2016 08:57:12 at java.lang.Thread.run(Unknown Source) [?:1.8.0_73]
  04.04.2016 08:57:12 [iNFO] Erik_Steiner lost connection: TranslatableComponent{key='disconnect.genericReason', args=[internal Exception: java.io.IOException: Eine vorhandene Verbindung wurde vom Remotehost geschlossen], siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null}}
  04.04.2016 08:57:12 [iNFO] Erik_Steiner left the game
   
  

Feel free to ask for more information. Thank you for your help!