Don’t Crash Tom (NeoForge 1.21.1)
A micro patch for Tom’s Simple Storage that stops a rare but annoying crash from BlockCapabilityCache when chunks unload, dimensions change (portals), or capability caches are invalidated.

What it fixes

Tom’s Simple Storage PlatformInventoryAccess.BlockInventoryAccess calls itemCache.getCapability() even after the cache is invalid.
When the cache is dead, NeoForge throws an IllegalStateException, crashing or kicking the server/client.
This mod intercepts tracker() and exists() and bails out if the cache is null/invalid instead of touching the dead cache.

Scope

Stability-only. No gameplay, balance, loot, GUIs, or configs.
Safe to add to existing worlds; remove anytime once upstream includes the fix.
Tiny footprint: just a mixin that guards the capability lookup.

Requirements

Loader: NeoForge 21.1.x
Game: Minecraft 1.21.1
Target mod: Tom’s Simple Storage (tested with 1.21-2.2.3). Other minor versions likely fine as long as the same BlockInventoryAccess class/methods exist.

Compatibility

No worldgen, no items/blocks, no mixins beyond Tom’s Simple Storage PlatformInventoryAccess.BlockInventoryAccess.
Should coexist with other storage/network mods and general optimization mods.

How to tell it worked

The specific BlockCapabilityCache crash on chunk unload/portal travel no longer occurs.
Log line on load: “DontCrashTom loaded - Tom’s Storage BlockCapabilityCache fix active”.
Occasional debug log when it prevents an invalid cache access (can be ignored).

Why you’d want this

Prevents unexpected crashes on busy servers where chunks unload/reload frequently or players portal around.
Zero configuration, zero gameplay impact; pure stability patch.