CreateVaultFix
by pirogram
CreateVaultFix stops a client-side crash that occurs when Create's item vault screen is opened alongside Relics-style equipment slots.
What it does
The crash is an IndexOutOfBoundsException. It happens because the server and the client disagree about slot indices for the Curios-based extra inventory slots, and the client then receives container slot update packets that point at slots the open menu does not contain. The mod intercepts those invalid packets on the client before the exception is raised, and cancels their processing safely, so the Create custom container menu stays usable.
The fix is needed only by players who use Create's item vault together with equipped Artifacts items. The mod is published for NeoForge on 1.21.1 only, alongside a matching Create build for that version. Its environment is client-side only, so servers do not need it, though the author notes that a server-side installation is still needed for the full setup. It is released under the MIT License and is not open source.
Key features
Invalid packet interception
Container slot update packets that reference slot indices absent from the current menu are caught on the client.
Safe packet cancellation
Packets pointing at non-existent slots are dropped instead of processed, which prevents the exception.
Create vault compatibility
The item vault screen keeps working, so players can still move items into and out of Create's custom container menu.
Curios slot synchronization
The fix addresses the mismatch between server and client Curios-based extra inventory slots that causes the crash.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Players on NeoForge 1.21.1 who run Create, Curios-based extra slots and Artifacts, and who see IndexOutOfBoundsException crashes when opening a Create item vault.
How it compares
Aeronautics Hot Air Fix is a client-side only NeoForge fix for 1.21.1, released under the 0BSD license and not open source. Fix Create Keybind Crash is a NeoForge fix for 1.21 – 1.21.1 that runs on client and server, under a custom license and not open source. Resettable Trial Vaults & Spawners is a Fabric, NeoForge and Quilt server-side only mod for 1.21 – 26.3, open source under the MIT License. CreateVaultFix targets only the Create item vault crash on 1.21.1.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| CreateVaultFix | NeoForge | 1.21.1 | Client-side only | 2026-08-21 |
| Aeronautics Hot Air Fix | NeoForge | 1.21.1 | Client-side only | 2026-08-27 |
| Fix Create Keybind Crash | NeoForge | 1.21 – 1.21.1 | Client and server | 2026-08-24 |
| Resettable Trial Vaults & Spawners | Fabric, NeoForge and Quilt | 1.21 – 26.3 | Server-side only | 2026-10-14 |
Questions
Which loader does CreateVaultFix need?
Does the server need CreateVaultFix?
Does CreateVaultFix work with Artifacts?
In the catalog
CreateVaultFix is one of 36,990 Utility mods on ModsFinder, and one of 13,477 Utility mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
More from pirogram
Similar mods
What the author says
A lightweight client-side compatibility patch that prevents crashes when using Create Item Vault together with Relics or Artifacts mods. This happens because of a slot synchronization issue between the server and client when Curios-based additional inventory slots interact with Create's custom container menu.
Official listing
- Modrinth page
- modrinth.com/mod/createvaultfix
- Owner
- pirogram
- Published
- 2026-08-21
- Updated on Modrinth
- 2026-08-21
- Facts verified
- 2026-10-15