Unsafe World Random Access Detector (Forge)
Modby 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
252,843
CurseForge ID
853354
Last Updated
Apr 12, 2026
Description
Unsafe World Random Access Detector (Forge)
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 fabric versions? Looking for neoforge versions?

Screenshots
Similar Mods
Leave My Bars Alone
Makes your food and experience bars visible when riding on a horse.
JEI Utilities
Added more enhancements to JEI
Flan's Mod: Legacy
Planes, Helicopters, Mechas, Vehicles, Guns, Multiplayer Gamemodes
DarkZoom - RPG Simplest Zoom
RPG Style, Allows you to enter a basic zoomed mode. Works server-side too.
ATi Structures - Vanilla Edition
A collection of custom structures and dungeons!
Upstream
A mod that adds endless, wider rivers, and configurable rivers!