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EntityGuardian project artwork

CurseForge · Minecraft mod

EntityGuardian

Prevents chunk-loading crashes by fixing ConcurrentModificationExceptions in entity management.

Choose a version Pick your version below, then grab the matching file.

Quick answer

Which EntityGuardian release should I use?

Updated 1 year ago
Latest stable file entityguardian-1.0.jar
Game version 1.21.1
Loader NeoForge

entityguardian-1.0.jar targets 1.21.1 with NeoForge. The project page does not say whether this file belongs on the client, dedicated server, or both. No extra mods listed for this file.

Where it goes

Is EntityGuardian required on the client, server, or both?

The project page does not say whether this file belongs on the client, dedicated server, or both.

Client Source doesn’t say
Dedicated server Source doesn’t say
Loader for this release NeoForge
Required install it here Optional supported, not mandatory Not supported do not install here Source doesn’t say do not assume

The source does not explicitly classify this release as client-only or server-only.

Understand client and server requirements Read the Minecraft installation guide

What else does entityguardian-1.0.jar need?

entityguardian-1.0.jar. Change the file and its required mods may change too.

No extra mods listed for this file

This file does not list any required mods. Do not add a library just because a different file uses it.

This file does not list any required or optional mods.

Before you install it

Add EntityGuardian without breaking your instance.

Built for entityguardian-1.0.jar. Pick another file and the loader, install side or required mods may change.

  1. 01

    Stick to this file

    Use entityguardian-1.0.jar. It targets 1.21.1 with NeoForge; another release may have different loader, side or dependency requirements.

  2. 02

    Bring the mods it needs

    This file does not list any required mods. Do not add a library just because a different file uses it.

  3. 03

    Put it on the correct side

    The project page does not say whether this file belongs on the client, dedicated server, or both.

  4. 04

    Pick the file you checked

    Use the “Get this file” button beside entityguardian-1.0.jar. It opens that exact file at the source.

About this project

What does EntityGuardian add?

EntityGuardian is a lightweight stability mod that eliminates frustrating ConcurrentModificationException crashes during world ticking, specifically those occurring in Minecraft's entity management system. These crashes often happen when mods like Smoothchunk or server optimizers asynchronously modify entity data while the game is processing chunks.

Key Features:
🛡️ Crash Prevention - Patches PersistentEntitySectionManager to safely handle concurrent entity list modifications
⚙️ Zero Configuration - Works out-of-the-box without config files or user input
🔌 Wide Compatibility - Designed for Minecraft 1.21.1 (NeoForge) and compatible with most modpacks
⚡ Performance-Safe - Minimal overhead with efficient snapshot-based synchronization

How It Works
EntityGuardian uses targeted bytecode transformations to:

  1. Replace unsafe entity list iterations with thread-safe snapshots
  2. Prevent modification conflicts during chunk status updates
  3. Maintain vanilla behavior while adding crash protection

Intented to fix FTB Skies 2 CME crashes, but works for anything else.

Project description from CurseForge.

Pick your setup

EntityGuardian by Minecraft version and loader

Choose the version and loader you play, then open the matching release.

1 available setups

Check the dependencies, then try the file in a copied instance before changing a world you care about.

Recent files

EntityGuardian versions and loaders

1 of 1 releases match

Looking for an older file? The official CurseForge project page is in Resources.

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