How to Fix a Lap Counter That Double-Counts on the Finish Line

Players report finishing on lap 3 when they only completed two laps. The cause is almost always the finish trigger firing more than once per pass, either from collider jitter or from re-entering the volume while braking on the line.

How to fix it

1. Add a per-car crossing cooldown

Record the time of the last finish crossing per car and ignore any new OnTriggerEnter within a short window (for example 1-2 seconds). This swallows the duplicate events from a collider straddling the volume.

2. Require a mid-lap checkpoint

Only count the finish line if the car has passed at least one mandatory checkpoint since the last lap. Reset a passedMidpoint flag at the finish and set it at the checkpoint, so reversing over the line does nothing.

3. Use the collider center, not any contact

Trigger the count from a single point such as the car's root transform crossing the line plane, rather than any part of the physics collider overlapping the trigger, to avoid multi-contact firing.

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 Unity 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.