Entity UUID conflicts can create noisy logs and lead to avoidable crashes, especially on busy worlds and servers. DEUF Refabricated Mod is a Fabric port of DEUF (Duplicated Entity UUID Fixer) by CAS-ual-TY that fixes duplicated UUIDs when entities spawn, reducing log spam and addressing some crash scenarios. It only needs to be installed on the server to work, though it is also recommended for modpacks so the same issue can be handled in singleplayer. It does not repair duplicated entities that already exist in a world, so those must be removed separately.
Key Features
- Fixes duplicated entity UUIDs on spawn to prevent the same issue from affecting future entities.
- Reduces log spam caused by duplicated UUID conflicts.
- Helps address some crashes linked to duplicated entity UUIDs.
- Works with server-side installation, making it practical for multiplayer setups.
- Recommended for modpacks so singleplayer worlds can also benefit from the fix.
Screenshots
How to Install
- Install Fabric Modloader.
- Install Fabric API.
- Add DEUF Refabricated Mod to your mods folder.
- Install it on the server to enable the fix; include it in modpacks if you also want coverage in singleplayer.
Requirements
| Requirement | Details |
|---|---|
| Mod Loader | Fabric, Quilt |
| Dependencies | Fabric Modloader, Fabric API |
| Minecraft Version | Unknown |
Pros & Cons
Pros
- Targets a specific world and server issue with a clear purpose.
- Server-side installation is enough for the fix to work.
- Can also be included in modpacks for singleplayer use.
- Published on Modrinth with MIT License and over 3.6 million downloads listed.
Cons
- Does not fix duplicated entities that already exist in a world.
- Only applies the fix when entities spawn.
- Provided version data in this source is limited.
Download
Always download mods from official sources to stay safe.
What's New
- Added 1.21 support.
- Modrinth project updated on 2024-06-13.
- Modrinth listing published on 2023-11-23.
FAQ
What does DEUF Refabricated Mod fix?
It fixes duplicated entity UUIDs on spawn, which helps remove related log spam and can fix some crashes tied to that issue.
Do I need to install DEUF Refabricated Mod on both client and server?
No. Available information states that it only needs to be present on the server to work, although it is recommended for modpacks so singleplayer can benefit too.
Will this mod repair duplicated entities already in my world?
No. Existing duplicated entities are not repaired by the mod. According to available information, those entities must be removed separately, while future spawned entities will not be duplicated when the mod is installed.
![[Let's Do] Meadow Mod (1.21.1) - thumbnail](http://mcinside.com/wp-content/uploads/2026/04/thumbnail-64-52x52.webp)
![Not Enough Recipe Book [NERB] Mod (1.21.11) - thumbnail](http://mcinside.com/wp-content/uploads/2026/04/thumbnail-63-52x52.webp)
