Quick answer: Clamp the wallet to a defined maximum after adding rewards, and store gold as a wide enough integer type so it cannot overflow before you clamp it.
If a rich player suddenly goes broke after one fight, the wallet overflowed. Here is how to cap gold safely.
How to fix it
1. Watch for precision loss
GameMaker reals lose integer precision past 2^53, so keep your gold cap well below that and treat the wallet as a whole number.
2. Clamp after adding
After awarding gold, run wallet = min(wallet + reward, max_gold) so the wallet never exceeds the cap or goes negative.
3. Surface the cap
If the player is at the cap, show a brief "wallet full" note so lost gold is intentional and communicated rather than a silent bug.
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 GameMaker 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.
Most of the time the fix is small. Seeing the failure clearly is the part that actually costs you.