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Encountered Client-Side NPE when joining modded server

CA Akira

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Minecraft Version: 1.18.2

Forge Version: 40.1.84

Logs: Client: https://gist.github.com/Akiraca/04c52485839b0299b34486dceb943310 Server: https://mclo.gs/XM2BNi7 (please ignore the last part where the server runs into an error)

Image of the error message: 199431823-b5e33834-8a61-49e6-b2e6-905482

Description of issue: Internal Exception: java.lang.NullPointerException: Cannot invoke "net.minecraft.network.protocol.Packet.m_5797_(net.minecraft.network.PacketListener)" because "packet" is null

Edited by CA Akira
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  • CA Akira changed the title to Encountered Client-Side NPE when joining modded server

One of your mods has broken networking code.

This is a list of all the mods that are creating custom channels.


[02:53:48] [Netty Client IO #1/ERROR]: Channels [blue_skies:main,structure_gel:main,guardvillagers:main,sophisticatedbackpacks:channel,toms_storage:main,redstonepen:default_ch,essentials:channel,minecraft:treechop-channel,constructionwand:main,worldstripper:network,diet:main,forge:tier_sorting,alexsmobs:main_channel,chiselsandbits:chiselsandbits,paraglider:master,kleeslabs:network,crafttweaker:main,blueprint:net,moreminecarts:example,create:main,createaddition:main,comforts:main,doubleslabs:main,carryon:carryonpackets,citadel:main_channel,create_confectionery:create_confectionery,curios:main,enchantwithmob:net,polymorph:main,selene:network,quark:main,damagetilt:main,supplementaries:network,sophisticatedcore:channel,geckolib3:main,twilightforest:channel] rejected vanilla connections

You should check you have the latest versions of these mods. And check if any of these have known issues,


You didn't post your debug.log so we can't see much else.

And Mojang's networking errors are logged at DEBUG. To see them you need to add the following property to your jvm arguments (same place you change the memory)



But I suspect it won't show which mod is causing the problem? Since this is a missing data issue there is probably no relevant information to log.

We might be able to work it out from previous messages in the log.


Failing that, you will need to experiment in a test/backup world with removing mods until you find the problem one.


If you don't post your logs/debug.log we can't help you. For curseforge you need to enable the forge debug.log in its minecraft settings. You should also post your crash report if you have one.

If there is no error in the log file and you don't have a crash report then post the launcher_log.txt from the minecraft folder. Again for curseforge this will be in your curseforge/minecraft/Install

Large files should be posted to a file sharing site like https://gist.github.com  You should also read the support forum sticky post.

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