Stonecutter Fix
by Hellixaro
Stonecutter Fix repairs the stonecutter's output slot so that shift-clicking a result no longer throws an UnsupportedOperationException.
What it does
Shift-clicking an item in the stonecutter output slot caused a crash with an UnsupportedOperationException in the vanilla code path. This mod corrects that handling so the click completes normally. It is published for NeoForge only, for Minecraft 1.21.1, under the MIT License, and it is not open source.
Key features
Shift-click repair
Moving stonecutter results with shift-click no longer triggers the UnsupportedOperationException crash.
Client-leaning install
The author recommends installing it mainly on the client, since a server-side install can cause item losses from desync.
Optional on servers
Either side can run it, and the author notes that servers gain little from it beyond the desync fix.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Questions
Does Stonecutter Fix need to be on the server?
In the catalog
Stonecutter Fix 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.
Similar mods
What the author says
Fixes the horrendous "UnsupportedOperationException" when clicking in the stonecutter output, and shift clicking. Mainly client side, but it's recommended to also install server side to avoid any item losses due to desync.
Official listing
- Modrinth page
- modrinth.com/mod/stonecutter-fix
- Owner
- Hellixaro
- Published
- 2026-08-25
- Updated on Modrinth
- 2026-08-25
- Facts verified
- 2026-10-15