Why does my game crash loading some players' saves but not mine?

Because save-load crashes depend on the player's specific save, which differs from your test saves. A player's save might be corrupt (from an interrupted write), from an older version your current code can't parse, or contain data in a state your loading code doesn't handle, crashing on load. Your test saves don't have those states, so it doesn't crash for you. Capturing the crash with version context reveals the conditions (often a version incompatibility) and points at the loading code as the cause.

How do I fix crashes when loading a save?

Make save-loading robust to bad data: handle corrupt saves gracefully (detect and recover or fall back rather than crashing), add version migration so older saves are correctly converted to the current format, fix the deserialization bugs that crash on unexpected data, and validate save data on load. Capturing the crash (the stack trace points at the loading/deserialization code) and the version context (which often reveals an incompatibility) helps identify the cause. The goal is that a problematic save degrades gracefully instead of crashing and locking the player out.

What Causes Crashes When Loading a Save?

Quick answer: Crashes when loading a save come from problems reading the save data: corrupt saves, version incompatibility, deserialization bugs, missing or unexpected data, and out-of-memory from a large save. They depend on the player's specific save.

Crashes when loading a save are especially painful because they can lock a player out of their progress. They come from problems reading the save data. Here's what causes crashes when loading a save.

Why Loading a Save Crashes

Loading a save means reading and reconstructing the player's saved state, and crashes happen when that data can't be read or reconstructed correctly.

Corrupt save files, a save that's damaged or incomplete (from an interrupted write) that the game can't parse
Version incompatibility, a save written by an older (or different) version the current version can't read
Deserialization bugs, errors in the code that reads and reconstructs the save data
Missing or unexpected data, the save missing fields, or containing data the code doesn't handle
Out-of-memory, loading a large save exceeding available memory
Schema or format changes, the save format changing without proper migration

Most save-load crashes trace to the save data being in a state the loading code can't handle, corrupt, incompatible, or unexpected.

Why They're Save-Specific

Save-load crashes depend on the player's specific save, so they hit players with a particular save state (corrupt, old version, unusual data) and not you, your test saves are different. This makes them hard to reproduce without the affected save.

Bugnet captures crashes with context, so save-load crashes surface with the conditions, and the stack trace points at the loading code. Knowing the crash is in save-loading, and what versions or conditions correlate, helps identify the cause.

Finding and Fixing Save-Load Crashes

Finding them means capturing the crash (the trace points at the loading/deserialization code) and the context (version, which often reveals an incompatibility). Then you fix the cause, handle corrupt saves gracefully (don't crash, recover or fall back), add version migration, fix the deserialization bug, and validate save data on load.

Bugnet captures the crash and version context for save-load crashes, helping you find the cause. So crashes when loading a save come from corrupt, incompatible, or unexpected save data, and fixing them means handling bad data gracefully, migrating versions, and validating saves, so a save problem doesn't crash or lock out the player.

Save-load crashes come from corrupt saves, version incompatibility, deserialization bugs, and unexpected data. They depend on the player's specific save, so capture the crash with version context, and handle bad data gracefully, migrate versions, and validate saves.