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Unsafe World Random Access Detector (Fabric) logo

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

10,306,526

CurseForge ID

821683

Modrinth Downloads

1,744,742

Modrinth ID

MsGuTgPJ

Last Updated

Nov 6, 2026

Description

Unsafe World Random Access Detector (Fabric)

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.

Looking for forge versions? Looking for neoforge versions?

Example

Note: If you are already using C2ME, this mod is not needed (but won't crash if used together anyway).

Compatibility

Mod Loaders

Client Fabric Server

Game Versions

1.21 1.19.3 1.20.2 1.19.4 1.21.8 1.20.5 1.21.5 1.21.4 1.20.1 1.20 +14 more

Recommended Gear

Affiliate

Hardware and extras that pair well with this mod.

Mini PC for self-hosting

Mini PC for Self-Hosting

A low-power box that can sit in a cupboard and run a modded server around the clock.

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As an Amazon Associate I earn from qualifying purchases.

Screenshots

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Included in Modpacks (18)

Prominence™ II: Hasturian Era Prominence™ II: Hasturian Era DarkRPG - RPG with Magic, Origins, Quests, Adventure DarkRPG - RPG with Magic, Origins, Quests, Adventure Prominence™ II: Hasturian Era Prominence™ II: Hasturian Era TownCraft TownCraft Elysium Days Elysium Days Easycraft (Official) Easycraft (Official) Biomes and Dungeons (BAD) RPG & Magic Biomes and Dungeons (BAD) RPG & Magic SimplyVanilla SimplyVanilla Yes Nicer MC [Fabric] YNM Yes Nicer MC [Fabric] YNM Vanilla QOL Improved Vanilla QOL Improved Essential Medieval [FABRIC] Essential Medieval [FABRIC] LebaneseMC LebaneseMC MysticCraft Divivded Kingdoms MysticCraft Divivded Kingdoms LUI BATTLE PACK LUI BATTLE PACK Goonables Goonables Figuratives 2 Figuratives 2 Ekaii Plus Ekaii Plus Empire Vanthex Heavy Modpack Empire Vanthex Heavy Modpack

External Resources

CurseForge Modrinth Source Code Issues