Why does my game crash on startup for some players but not me?

Almost always corrupted persistent data or a platform difference. Your own config, save, and machine are fine, so you never hit it, but a player with a corrupted save or config, a missing asset, or unsupported hardware does. Capture the crash from their machine, the stack trace usually points right at the failing load, and make that load defensive so bad data resets instead of crashing.

How do I find what is causing a startup crash?

Read the crash's stack trace and logs, which for a startup crash usually point almost exactly at the failing operation, an asset load, a deserialize, an init call. Since you often cannot reproduce a player's startup crash locally, capture it from their machine with a crash reporter that records the trace, device context, and build version automatically.

How do I stop a corrupted save from crashing my game on startup?

Load save and config data defensively: wrap the load so that if the data is corrupt or unexpected, you catch the error, reset to a safe default, and continue rather than crashing. Validate or version your save format so old or malformed files are handled. This turns a fatal startup crash (and potential crash loop) into a recoverable one.

How to Fix a Game That Crashes on Startup

Quick answer: Startup crashes almost always trace to something the game reads or sets up at boot: a corrupted config or save file, a missing or unloadable asset, or initialization happening in the wrong order. Capture a crash report to get the stack trace, which usually points right at the cause, then make the offending load defensive so a bad value fails gracefully instead of crashing.

A game that crashes on startup is one of the most urgent bugs you can have, because it makes the game completely unplayable, the player never even gets in. The good news is that startup crashes are usually tractable: they happen during a bounded, predictable sequence (boot and initialization), so the cause is almost always in something the game loads or sets up before the main menu appears.

Common Causes of Startup Crashes

Startup is when the game loads a lot of state at once, and any of it can be the culprit. The usual suspects: a corrupted or unexpected save file or config that the loading code chokes on; a missing, renamed, or unloadable asset the game assumes is present; initialization order bugs where one system runs before another it depends on is ready; and platform or hardware issues like an unsupported GPU or missing runtime dependency.

A telling pattern is when the crash happens for some players but not you, that usually means corrupted persistent data or a platform difference, since your own config and machine are fine. Startup crashes that began after an update often point at a data-format change that breaks on data written by the old version.

How to Diagnose It

The fastest path to the cause is the crash's stack trace and logs, which for a startup crash usually point almost exactly at the failing line, the asset load, the deserialize call, the init function. Since you often cannot reproduce a player's startup crash on your own machine (their data and hardware differ), you need the crash captured from their machine.

Bugnet's crash reporting captures the stack trace, device context, and recent logs automatically when the game crashes, even on startup, so a player's boot crash arrives diagnosable with the build version attached. Grouping startup crashes by signature shows whether they share a cause (the same asset, the same config field), and the device context reveals if they cluster on particular hardware.

How to Fix It

Once the trace points at the cause, the fix is usually to make the risky startup operation defensive. Wrap config and save loading so that if the data is corrupt or unexpected, the game catches the error, resets to a safe default, and continues instead of crashing, this alone resolves the largest category of startup crashes and prevents crash loops. Validate or version your save and config formats so an old or malformed file is handled rather than fatal.

For missing-asset crashes, verify the asset is actually included in the build (a frequent editor-versus-build difference) and handle a failed load gracefully. For init-order bugs, ensure dependencies are ready before dependents run. For platform/hardware crashes, check the minimum spec and degrade gracefully when an unsupported feature is unavailable. The throughline: nothing the game reads at startup should be able to crash it, defensive loading turns a fatal startup crash into a recoverable one.

A startup crash makes the game unplayable, so it's top priority. The cause is almost always something loaded at boot, capture the trace, and load risky data defensively.