Mod Unsafe World Random Access Detector

Unsafe World Random Access Detector, a diagnostic Minecraft mod

Unsafe World Random Access Detector is a utility mod for Fabric, Forge, and NeoForge that detects unsafe world access from the wrong thread. It helps identify which mod or process may be triggering the “Accessing LegacyRandomSource from multiple threads” crash, a particularly frustrating issue in heavily modded environments.

This mod does not repair the underlying problem or change gameplay. Instead, it provides valuable diagnostic clues for troubleshooting intermittent crashes on a Minecraft server or client. At BoxToPlay, we recommend it as a lightweight investigation tool for complex modpacks. If C2ME is already present, it may not be necessary.