How to Fix Unreal SaveGame Slots Colliding From a Shared Slot Name

SaveGameToSlot keys files purely on the slot-name string. Reuse the same name in two places and they clobber each other. Use unique names and the right UserIndex.

How to fix it

1. Use distinct slot names

Generate unique names like "AutoSave_0" and "Manual_Slot1" so autosave and manual saves never write the same SaveGameToSlot file.

2. Set the correct UserIndex

For per-player or per-profile saves, pass a distinct UserIndex so different users do not share a slot file.

3. Centralize name generation

Route all save/load through one helper that builds slot names from a profile and purpose, removing the chance of an accidental duplicate string.

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 Unreal Engine 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.