This is a backport of Advancements Debug for Legacy Fabric versions 1.12-1.13.2.
This little mod rewrites one function of the advancements logic to make advancements checking faster, and use less recursion. It should prevent StackOverflowErrors with advancements.
If net.minecraft.class_3347.method_14931 appears in the crash log, this mod is likely going to fix it.
This mod can be installed on the server-side only if you are having issues on a server, but it can also be useful on the client when playing in single-player worlds.
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.12, 1.12.1, 1.12.2
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
Verified by MCModsHub
- Ships as legacy-advdebug-2.3.0.jar — drop this file into the mods folder
- Download size: 10 KB
- Download link checked 31 Aug 2026 — working
These come from our own check of the pack file, not from the source page.