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The crash: Your Minecraft 1.21.1 NeoForge server was crashing every time a player used Carry On to pick up an entity or block. The root cause was a NullPointerException inside StringTagVisitor.visitCompound(): Minecraft tried to sort the NBT keys of whatever was being carried, but one of those keys was null, causing Java's TimSort to explode.

The fix: We built a small standalone NeoForge mod called CarryOnFix that uses a Mixin to intercept the Collections.sort() call, strip any null entries from the list, and then let the sort proceed normally. Two lines of actual logic.

Mod features:

Server-side only — clients don't need it installed, just drop the jar in the server's mods/ folder
No extra dependencies
Compatible with NeoForge 21.1.228 / Minecraft 1.21.1

Bumps along the way:

IExtensionPoint and NetworkRegistry no longer exist in NeoForge 21.1 and ca

CarryOnFix

File DetailsDownloadInstall

CarryOnFix-1.0.0.jar

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Supported Versions

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