Quick answer: Latch a single game-over flag the first time a condition is met, run the end flow once, and skip all further victory checks while latched.
If the win screen stacks up or the score is awarded twice, your victory check fires repeatedly. Latching the end state fixes it. Here is how.
How to fix it
1. Latch on first trigger
Keep a GameOver flag that starts false. The first time a win or loss condition is true, set it and run the end-of-game flow once.
2. Short-circuit further checks
At the top of the victory-check routine, return immediately if the flag is set, so a condition that remains true does not keep firing handlers.
3. Resolve ties deterministically
If multiple conditions can be met in the same tick (mutual destruction), define a priority so exactly one outcome wins and the flag locks in a single, consistent result.
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 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.
Reproduce it once with full context and the fix writes itself. The hunt is the expensive part.