Quick answer: Get the crash context from the first reports, compare the release build and config against a known-good one, identify the missing file or wrong setting, and ship a hotfix.
A release that crashes on startup for everyone is an emergency, and it is almost always a packaging or config mistake the build introduced. Fast diagnosis and a hotfix is the response. Here is how.
How to fix it
1. Get crash context immediately
Pull the stack and context from the first crash reports. A startup crash hitting everyone has one cause; the stack and the missing resource or failed call it names points straight at it.
2. Compare against a known-good build
Diff the release build and its configuration against the last version that worked. A missing included file, a changed path, a wrong build setting, or a dead endpoint is usually the single difference that broke it.
3. Ship a hotfix and verify
Fix the specific mistake and release a hotfix fast, since every player is blocked. Verify on a clean machine (not your dev box, which may mask it) and watch the crash signature disappear as players update.
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.
A crash you can name from its stack trace is a crash you can usually fix in minutes.