[Crash]: Client disconnected with reason: Internal Exception: io.netty.handler.codec.EncoderException: Failed to encode packet 'clientbound/minecraft:custom_payload'

[TheOnlyChappell]

Possible Fixes

Yes

Modpack Version

6.0

Crash Assistant Message (big green button)

[28Feb.2026 05:09:42.752] [Server thread/INFO] [net.minecraft.server.MinecraftServer/]: ThreadedAnvilChunkStorage (reality_marble): All chunks are saved
[28Feb.2026 05:09:42.752] [Server thread/INFO] [net.minecraft.server.MinecraftServer/]: ThreadedAnvilChunkStorage (compact_world): All chunks are saved
[28Feb.2026 05:09:42.752] [Server thread/INFO] [net.minecraft.server.MinecraftServer/]: ThreadedAnvilChunkStorage (spatial_storage): All chunks are saved
[28Feb.2026 05:09:42.752] [Server thread/INFO] [net.minecraft.server.MinecraftServer/]: ThreadedAnvilChunkStorage: All dimensions are saved
[28Feb.2026 05:09:44.661] [Server thread/INFO] [Framework/]: Unloading server configs...
[28Feb.2026 05:09:44.662] [Server thread/INFO] [Framework/]: Sending config unload event for refurbished_furniture.server.toml
[28Feb.2026 05:09:44.662] [Server thread/INFO] [Framework/]: Finished unloading server configs
[28Feb.2026 05:09:44.747] [Render thread/INFO] [ChunkBuilder/]: Stopping worker threads
[28Feb.2026 05:09:45.208] [Render thread/WARN] [net.minecraft.client.multiplayer.ClientCommonPacketListenerImpl/]: Client disconnected with reason: Internal Exception: io.netty.handler.codec.EncoderException: Failed to encode packet 'clientbound/minecraft:custom_payload'
[28Feb.2026 05:09:45.214] [Render thread/WARN] [structurize/]: Client logged off. Resetting Pack Meta and Reloading State
[28Feb.2026 05:09:45.218] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Shogun
[28Feb.2026 05:09:45.219] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Rebel_Base
[28Feb.2026 05:09:45.219] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Nile
[28Feb.2026 05:09:45.219] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Byzantine_for_1.20
[28Feb.2026 05:09:45.220] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Jungle Treehouse
[28Feb.2026 05:09:45.220] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Ancient Athens
[28Feb.2026 05:09:45.220] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Cavern
[28Feb.2026 05:09:45.220] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Shire
[28Feb.2026 05:09:45.220] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Medieval Spruce
[28Feb.2026 05:09:45.220] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Nordic Spruce
[28Feb.2026 05:09:45.220] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Urban Savanna
[28Feb.2026 05:09:45.220] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Space Wars
[28Feb.2026 05:09:45.220] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Minecolonies Original
[28Feb.2026 05:09:45.220] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Caledonia
[28Feb.2026 05:09:45.220] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Medieval Birch
[28Feb.2026 05:09:45.220] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Fortress
[28Feb.2026 05:09:45.221] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Urban Birch
[28Feb.2026 05:09:45.221] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Desert Oasis
[28Feb.2026 05:09:45.221] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Colonial
[28Feb.2026 05:09:45.221] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Dark Oak Treehouse
[28Feb.2026 05:09:45.221] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Pagoda
[28Feb.2026 05:09:45.221] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Medieval Dark Oak
[28Feb.2026 05:09:45.221] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Stalactite Caves
[28Feb.2026 05:09:45.221] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Warped Netherlands
[28Feb.2026 05:09:45.221] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Medieval Oak
[28Feb.2026 05:09:45.221] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Incan
[28Feb.2026 05:09:45.221] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Lost Mesa City
[28Feb.2026 05:09:45.221] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Underwater Base
[28Feb.2026 05:09:45.221] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Aquatica
[28Feb.2026 05:09:45.221] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Steampunk
[28Feb.2026 05:09:45.221] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: High Magic
[28Feb.2026 05:09:45.221] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Frontier
[28Feb.2026 05:09:45.222] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Hive
[28Feb.2026 05:09:45.222] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Tropical
[28Feb.2026 05:09:45.222] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Crimson Keep
[28Feb.2026 05:09:45.222] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Functional Fantasy
[28Feb.2026 05:09:45.222] [Structurize IO Worker #3/WARN] [structurize/]: Missing Mod: byg for Pack: Corrupted
[28Feb.2026 05:09:45.222] [Structurize IO Worker #3/WARN] [structurize/]: Missing Mod: quark for Pack: FairyTale
[28Feb.2026 05:09:45.222] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Antique
[28Feb.2026 05:09:45.222] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: Farthest Frontier
[28Feb.2026 05:09:45.224] [Structurize IO Worker #3/INFO] [structurize/]: Registered structure pack: TheOnlyChappell
[28Feb.2026 05:09:45.224] [Structurize IO Worker #3/WARN] [structurize/]: Finished discovering Client Structure packs

What happened?

When doing something like inserting or interacting with for example compacting drawers or the altar from mystical agri i just get kicked for the "custom payload" error.

Crash Log or Disconnect Log

No response

Latest.Log

No response

[kolivere]

I was able to figure out that this was happening to me with a wireless applied energistics terminal with autostock enabled. disabling autostock stopped the issue.