How do I find which update change caused a crash?

Use version-tagged crashes to confirm the crash is specific to the new build (absent on previous versions), then read the stack trace to see where it crashes and cross-reference that with what your update changed in that area. Because you're looking in a bounded, recent diff rather than the whole codebase, the cause is usually quick to find.

Should I roll back an update that's causing crashes?

If the regression is severe and crashing many players, yes, rolling back to the previous known-good version stops the damage immediately while you prepare a proper fix, which is often faster and safer than rushing a fix-forward under pressure. For less severe regressions, fix forward. Either way, verify with version-tagged reporting that the crash stops on the corrected build.

How to Fix a Game That Crashes After an Update

Q: Why did my game start crashing after an update?

Because the update introduced a regression, it both fixed and broke things, and now you need to find what it broke. The most common causes are a save or data format change that breaks on data written by the old version, or a new bug in the code the update changed. A crash that appears on the new version and wasn't there before is something the update did.

Quick answer: When crashes start after an update, the update introduced them, a regression. The most common causes are a save or data format change that breaks on data written by the old version, or a new bug in the changed code. Confirm the crash is specific to the new version (it appears on the new build and wasn't there before), look at what the update changed near where it crashes, and fix it, or roll back if it's severe.

A game that was stable suddenly starts crashing after you ship an update. Since the update is the only thing that changed, it introduced the crash, this is a regression. The update both fixed and broke things, and now you need to find what it broke. The good news is that knowing the crash started with a specific update dramatically narrows the cause: it's somewhere in what that update changed.

Why Updates Introduce Crashes

Any change can break something, and updates are full of changes. The most common update-introduced crashes: save/data format changes, the update changed how data is structured, and now the game chokes loading data written by the previous version (a very common cause of post-update startup crashes and crash loops). New bugs in changed code, a fix or feature introduced a defect. And changed dependencies or assets, the update altered something the game relies on, breaking it on some configurations.

Players are also in mixed states after an update, some on the new version, some briefly still on the old, which can complicate the picture. But the core fact is clear: a crash that appears with the new version and wasn't there before is something the update did.

How to Diagnose It

Version-tagged crash data is exactly what you need here. With each crash tagged by build version, you can confirm the crash is specific to the new version, it appears on the new build and was absent (or far rarer) on previous ones, which is the signature of a regression the update introduced. This both confirms it's update-caused and tells you the crash lives in what changed between the versions.

Bugnet tags every crash with its build version, so a crash that suddenly starts on the new release stands out immediately against the prior baseline. The stack trace then points at where it crashes; cross-reference that with what your update changed in that area, the code you touched, the data format you altered, and the cause is usually quick to find because you're looking in a bounded, recent diff rather than the whole codebase.

How to Fix It

For a save/data format regression, handle the old format, add migration or validation so data written by the previous version is upgraded or safely handled rather than crashing (and going forward, version your save format so this doesn't recur). For a new code bug, the trace plus your knowledge of what you changed usually pinpoints it; fix the defect the update introduced. In both cases, make the relevant load defensive so bad or old data fails gracefully.

If the regression is severe (crashing many players), consider rolling back to the previous known-good version to stop the damage immediately while you prepare a proper fix, restoring a working version is often faster and safer than rushing a fix-forward under pressure. After fixing, verify with version-tagged reporting that the crash stops on the new build, and confirm you didn't introduce another regression. Catching update regressions fast, via version-aware monitoring right after each release, is what keeps a routine update from becoming a prolonged crisis.

A crash after an update is a regression the update introduced. Version-tagged crashes confirm it's new, and the cause is in what you just changed, often a save format break.