Unsafe World Random Access Detector Mod is a mod that detects unsafe off-thread world random access, helping to find causes of “Accessing LegacyRandomSource from multiple threads” crash. This is useful for finding the cause of mysterious crashes with Accessing LegacyRandomSource from multiple threads. This is not a fix for the issue, but it will help you find the cause of the issue. Note: If you are already using C2ME (Concurrent Chunk Management Engine Mod), this mod is not needed (but won’t crash if used together anyway).
Screenshots:
Unsafe World Random Access Detector Mod Download Links
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.20.1
- 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: In MC Java Mods, or directly above on this page.
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
- Downloads as 2265.mcaddon
- Download size: 20 KB
- Download link checked 25 Sept 2026 — working
- Mirrored on our own servers — the download does not depend on the original host
These come from our own check of the pack file, not from the source page.