How to Fix a Unity Production Building Stalling When Its Output Buffer Is Full

A smelter that goes idle and stays idle even after the player clears its output usually has no resume trigger. It checked once, found the buffer full, and went to sleep without anything to wake it. Gate production on space and wake on free. Here is the fix.

How to fix it

1. Check for room before starting a batch

Before consuming inputs, verify the output buffer has space for the full output batch. If not, mark the building blocked rather than partially producing or busy-looping.

2. Wake on buffer free

When a hauler removes items from the output buffer, fire an event that re-queues blocked producers feeding that buffer, so they resume the same tick instead of waiting for a periodic rescan.

3. Add a periodic safety rescan

As a backstop, re-evaluate blocked buildings every few seconds so a missed wake-up event cannot permanently stall a production line.

Catching the ones you can't reproduce

The hardest version of this to fix is the one you can't reproduce — it only happens on a player's hardware, OS, driver, or save state, under conditions that simply aren't present on your machine. A report that says “it crashed” or “it froze” gives you nothing to act on, so the bug survives release after release while quietly costing you players.

Automatic error capture closes that gap. Each failure arrives with its full stack trace, the device and OS, the build number, and a breadcrumb trail of what the player did right before it broke, so even a failure you have never seen becomes a specific, reproducible issue. Fold identical failures into one signature ranked by how many players each hits, and your worklist sorts itself worst-first instead of arriving as a stream of vague complaints.

This is where a tool like Bugnet earns its place. Its SDK captures every Unity error automatically with the full stack trace plus device, OS, memory, build, and game-state context, folds duplicates into one grouped issue with an occurrence count, and ties each to the build it first appeared on — so you fix the problem that hurts the most players first and confirm it is gone when its signature disappears from the next release.