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Unsafe World Random Access Detector (Fabric)

Unsafe World Random Access Detector (Fabric)

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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10,145,515 downloads
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Updated Oct 14, 2026
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Utility & QoL
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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).

1.1.4
MC 1.21, Client, 1.19.3, 1.20.2, 1.19.4, Fabric, 1.21.8, 1.20.5, 1.21.5, 1.21.4, 1.20.1, 1.20, 1.20.6, 1.21.1, 1.21.6, 1.21.3, 1.21.7, 1.19.1, 1.20.4, 1.19.2, 1.20.3, Server
Release 2026-10-05 Get
1.2.0
MC Client, Fabric, Server, 26.1, 26.1.1, 26.1.2, 26.2, 26.3
Release 2026-03-24 Get
1.1.0
MC 1.21, Client, 1.19.3, 1.20.2, 1.19.4, Fabric, 1.21.8, 1.20.5, 1.21.5, 1.21.4, 1.20.1, 1.20, 1.20.6, 1.21.1, 1.21.6, 1.21.3, 1.21.7, 1.19.1, 1.20.4, 1.19.2, 1.20.3, Server
Release 2023-02-25 Get
1.0.0
MC 1.19.3, Fabric, Client, 1.19.2, 1.19.1, Server, 1.19
Release 2023-02-04 Get

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