How to Tell Which Build Introduced a Regression

A regression is a bug a specific build introduced. The fast way to find it is knowing which build each error came from. Then the culprit release is obvious. Here is how.

How to fix it

1. Tag errors with the build

Stamp every crash and error with the exact build or version it occurred on. A new crash signature whose first occurrence lands on a particular build tells you that build introduced it.

2. Watch for first-appearance

Track when each signature first appears. A signature that starts at build N and was absent in N minus one localizes the regression to the changes between those two builds.

3. Bisect the changes

With the build identified, review what changed between it and the previous good one. Bisect the commits if needed. Narrowing from all of history to one build's diff is what makes the fix quick.

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 your game 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.