Unsafe World Random Access Detector (Fabric)
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.
Downloads
8,701,930
Type
Mod
CurseForge ID
821683
Last Updated
Apr 9, 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?

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