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Unsafe World Random Access Detector (NeoForge)

Unsafe World Random Access Detector (NeoForge)

MOD
This is a mod that detects unsafe off-thread world random access, helping to find causes of "Accessing LegacyRandomSource from multiple threads" crash.
by ishlandmc
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167,454 downloads
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Updated Oct 14, 2026
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Utility & QoL
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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 forge versions?

Example

1.1.4
MC 1.21, Client, 1.21.8, 1.21.5, 1.21.4, 1.21.1, 1.21.6, 1.21.3, 1.21.7, NeoForge, Server, 1.21.2, 1.21.9, 1.21.10, 1.21.11, 26.1, 26.1.1, 26.1.2, 26.2, 26.3
Release 2026-10-05 Get
1.1.3
MC 1.21, 1.21.5, Client, 1.21.4, NeoForge, 1.21.3, 1.21.1, Server, 1.21.2
Release 2025-05-26 Get
1.1.1
MC 1.21, Client, NeoForge, 1.21.1, Server
Release 2024-09-29 Get

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