Flywheel Crash Fix
Java mod listed for Minecraft 1.20. Downloads from the MC Java Mods app on Android.
Prevents a game-crashing `NullPointerException` in Create's Flywheel rendering engine when a Frogport or Chain Conveyor encounters a package item with no…
⬇ Download on CurseForgeThe author built this one for Minecraft 1.20.1 on Forge. On other versions it may install and then do nothing.
Flywheel Crash Fix
Flywheel Crash Fix is a lightweight client-side Forge mod for Minecraft 1.20.1 that eliminates a NullPointerException crash triggered by Create's visual rendering system.
The Problem
When the Create mod renders its machines using the Flywheel rendering engine, the FrogportVisual and ChainConveyorVisual classes iterate over every item a Frogport or Chain Conveyor is currently handling. For each item they attempt to look up a registered visual model. If no model is registered for that item — which happens with package items from Create Mobile Packages that failed model registration — Flywheel receives a null partial model reference and throws a NullPointerException, immediately crashing the game client.
The Fix
This mod injects three Mixins into the Flywheel/Create rendering pipeline:
| Mixin | What it does |
|---|---|
AbstractBEVisualAccessorMixin |
Exposes the protected level field on AbstractBlockEntityVisual so downstream mixins can safely read it. |
FrogportVisualMixin |
Wraps the item-rendering loop in FrogportVisual with a null-check guard; skips any item whose visual model lookup returns null. |
ChainConveyorVisualMixin |
Applies the same null-check guard to ChainConveyorVisual's item-rendering loop. |
The fix is purely defensive — if models are correctly registered the code path is unchanged. No gameplay behaviour, item behaviour, or server logic is affected.
Compatibility
| Requirement | Version |
|---|---|
| Minecraft | 1.20.1 |
| Forge | 47.4.16+ |
| Create | 6.0.8+ |
| Flywheel | 1.0.5 |
This mod is client-side only and does not need to be installed on a dedicated server.
Why Does This Happen?
Create Mobile Packages registers visual models for its package items during the Flywheel model-registration phase. Under certain mod-loading orders or when model registration is interrupted, the registration fails silently and leaves a null entry in the model registry. Flywheel does not guard against this, so the first time a Frogport or Chain Conveyor tries to render one of those items the JVM throws and the game crashes.
The permanent fix is for Create Mobile Packages to harden its own model registration. Until that upstream fix is released, this mod provides a safe workaround.
Author
TheDarkAce — created as a targeted fix for the All Of Create + modpack.
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.20.1
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on CurseForge — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
- Ships as flywheelcrashfix-1.0.0.jar — drop this file into the mods folder
- Download size: 27 KB
- Download link checked 3 Oct 2026 — working
These come from our own check of the pack file, not from the source page.