game freezes when i make a theory in the research table in thaumcraft

[Fatjunk-1]

Modpack Version

eningmatica 2 experts 1.12.2

Describe your issue.

Hello everyone hope u doing good , my game just freezes on me when i try to make a theory dont know why i tried a few solution and nothing worked dont know why and i hope someone can help me here , i play on a server my friend owns and it freezes when i play in the server , i tried it in singleplayer and it works just fine dont know why and how .

Crash Report

didnt crash

Latest Log

https://gist.github.com/Fatjunk-1/ecbf829f276ee3f0ecb161feee4e6ea2

Have you modified the modpack?

No

User Modifications

No response

Did the issue happen in singleplayer or on a server?

Server

Discord Username

fatjunk.

[NielsPilgaard]

Hi 👋

Looks like it's a network issue of some sort, this is in the log thousands of times:

[13:19:20] [Client thread/ERROR]: FMLIndexedMessageCodec exception caught
java.lang.NullPointerException: null
	at net.minecraftforge.fml.common.network.FMLOutboundHandler$OutboundTarget$7.selectNetworks(FMLOutboundHandler.java:224) ~[FMLOutboundHandler$OutboundTarget$7.class:?]
	at net.minecraftforge.fml.common.network.FMLOutboundHandler.write(FMLOutboundHandler.java:378) ~[FMLOutboundHandler.class:?]
	at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:738) ~[netty-all-4.1.9.Final.jar:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:730) ~[netty-all-4.1.9.Final.jar:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:816) ~[netty-all-4.1.9.Final.jar:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:723) ~[netty-all-4.1.9.Final.jar:4.1.9.Final]
	at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:111) ~[netty-all-4.1.9.Final.jar:4.1.9.Final]
	at io.netty.handler.codec.MessageToMessageCodec.write(MessageToMessageCodec.java:116) ~[netty-all-4.1.9.Final.jar:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:738) ~[netty-all-4.1.9.Final.jar:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:801) ~[netty-all-4.1.9.Final.jar:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:814) ~[netty-all-4.1.9.Final.jar:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:794) ~[netty-all-4.1.9.Final.jar:4.1.9.Final]
	at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:831) ~[netty-all-4.1.9.Final.jar:4.1.9.Final]
	at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:1032) ~[netty-all-4.1.9.Final.jar:4.1.9.Final]
	at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:296) ~[netty-all-4.1.9.Final.jar:4.1.9.Final]
	at net.minecraftforge.fml.common.network.simpleimpl.SimpleNetworkWrapper.sendToAllAround(SimpleNetworkWrapper.java:264) [SimpleNetworkWrapper.class:?]
	at thaumcraft.common.tiles.TileThaumcraft.sendMessageToClient(TileThaumcraft.java:33) [TileThaumcraft.class:?]
	at thaumcraft.common.tiles.TileThaumcraftInventory.syncSlots(TileThaumcraftInventory.java:134) [TileThaumcraftInventory.class:?]
	at thaumcraft.common.tiles.TileThaumcraftInventory.func_70299_a(TileThaumcraftInventory.java:91) [TileThaumcraftInventory.class:?]
	at net.minecraft.inventory.Slot.func_75215_d(Slot.java:70) [agr.class:?]
	at net.minecraft.inventory.Container.func_190896_a(Container.java:527) [afr.class:?]
	at net.minecraft.client.network.NetHandlerPlayClient.func_147241_a(NetHandlerPlayClient.java:1191) [brz.class:?]
	at net.minecraft.network.play.server.SPacketWindowItems.func_148833_a(SourceFile:50) [is.class:?]
	at net.minecraft.network.play.server.SPacketWindowItems.func_148833_a(SourceFile:12) [is.class:?]
	at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) [hv$1.class:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_462]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_462]
	at net.minecraft.util.Util.func_181617_a(SourceFile:529) [h.class:?]
	at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1088) [bib.class:?]
	at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:3942) [bib.class:?]
	at net.minecraft.client.main.Main.main(SourceFile:123) [Main.class:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_462]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_462]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_462]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_462]
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.12.jar:?]
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]

Does the same happen for other players on the server?