JujutsuCraft Crash Fix
JujutsuCraft Crash Fix patches a crash in JujutsuCraft 50/50.1 where custom player variables are unexpectedly unavailable, and it is built for Forge on 1.20.1.
What it does
JujutsuCraft Crash Fix addresses a persistent PlayerVariables crash in JujutsuCraft 50/50.1 running on Forge. The crash happens when JujutsuCraft tries to reach its custom player variables object and finds that it is missing. The mod is a small Forge coremod transformer patch that runs alongside JujutsuCraft at load time, so the original mod is left untouched. Installing JujutsuCraft 50/50.1 is required, and Forge 47.x is the loader it targets.
The patch intercepts player-variable field accesses only inside the affected advancement procedure. When the variables are missing, it supplies a safe default value and ignores the invalid write, instead of letting Java throw a NullPointerException. Once the variables are available, JujutsuCraft behaves normally. The patch does not change world generation, mobs, structures, models, textures or other gameplay. JujutsuCraft Crash Fix is an unofficial compatibility patch, not affiliated with the original JujutsuCraft developer, and it is described as compatible with Jujutsu Vanilla World.
The mod runs on both client and server, so the server and every player need it. Its listed environment is client and server, and it is released under the MIT License, which is not open source. The latest Forge file is 1.0.1 for 1.20.1, published on 2026-08-24, the same day the mod was first published and last updated.
Key features
Safe player variable access
Reads and writes to the player variables inside the affected advancement procedure fall back to a safe default when the object is missing.
Invalid writes are ignored
Writes to unavailable player variables are dropped instead of triggering an exception that stops the game.
Narrow patch scope
The transformer touches only the affected field accesses, leaving the rest of JujutsuCraft and its content unchanged.
One-time startup message
Players who enter a world with the mod installed receive a one-time chat message the first time it loads.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
How it compares
JJC NBT FIX is a Forge 1.20.1 mod that runs on client and server, released under the MIT License. JujutsuEdit is a Forge 1.20.1 mod that is client-side only and released under All rights reserved. Better Jujutsu Craft Addon is a Forge 1.20.1 mod that runs on client and server under All rights reserved. JujutsuCraft Crash Fix differs from all three by targeting only the player-variable crash, not NBT data or editing features.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| JujutsuCraft Crash Fix | Forge | 1.20.1 | Client and server | 2026-08-24 |
| JJC NBT FIX | Forge | 1.20.1 | Client and server | 2026-07-02 |
| JujutsuEdit | Forge | 1.20.1 | Client-side only | 2026-03-09 |
| Better Jujutsu Craft Addon | Forge | 1.20.1 | Client and server | 2026-05-20 |
Questions
Does JujutsuCraft Crash Fix require JujutsuCraft?
Does the server need JujutsuCraft Crash Fix?
Which Forge version does the patch support?
What the author says
A small compatibility patch for JujutsuCraft 50/50.1 on Minecraft 1.20.1 Forge, created by MVQ1303. This happens when JujutsuCraft attempts to access its custom player variables while the PlayerVariables object is unexpectedly unavailable.
Official listing
- Modrinth page
- modrinth.com/mod/jujutsucraft-crash-fix
- Owner
- WhatWasMissing
- Published
- 2026-08-24
- Updated on Modrinth
- 2026-08-24
- Facts verified
- 2026-10-15