ModsJava
Illegal Stack Fixer
I don't know my version or loader
Open the Minecraft launcher and look at the profile you play on — it names both, like fabric-loader-1.21.4. The version also shows in the bottom-right corner of the game's main menu.
No loader in the profile name? Then it's plain Minecraft, and these mods won't run — you need Fabric or NeoForge installed first.
Illegal Stack Fixer
THIS MOD PAGE WILL NO LONGER BE UPDATED. GO TO MODRINTH TO GET THE LATEST VERSION
Requires the Fabric Loader and Fabric API
A Fabric Minecraft server to use the mod on
Setup
- Drop the mod in the server mods folder
Details
Illegal Stack Fixer is a server-side mod to set the stack size of any stack to the maximum stack size if the stack size is too big.
It detects all invalid stack sizes from chests-like blocks and entities with storage upon any non-creative player opening the inventory.
Download
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.20.4, 1.20.2, 1.20.3
- 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 CurseForge — 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 illegal_stack_fixer-mc1.20.4-1.0.1-build.10.jar — drop this file into the mods folder
- Download size: 20 KB
- Download link checked 24 Sept 2026 — working
These come from our own check of the pack file, not from the source page.