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Unsafe World Random Access Detector (Fabric)

Mod

by ishlandmc

This is a mod that detects unsafe off-thread world random access, helping to find causes of "Accessing LegacyRandomSource from multiple threads" crash.

Type

Mod

CurseForge Downloads

9,076,739

CurseForge ID

821683

Modrinth Downloads

1,305,162

Modrinth ID

MsGuTgPJ

Last Updated

Jun 11, 2026

Description

# Unsafe World Random Access Detector This 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. ![Example](https://cdn-raw.modrinth.com/data/MsGuTgPJ/images/fe2cfcfd5ba9fe881216f1e6cfc412b3bf56e50d.png) Note: If you are already using C2ME, this mod is not needed (but won't crash if used together anyway).

Compatibility

Mod Loaders

Fabric Forge Neoforge

Game Versions

1.19 1.19.1 1.19.2 1.19.3 1.19.4 1.20 1.20.1 1.20.2 1.20.3 1.20.4 +18 more

Screenshots

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Included in Modpacks

External Resources