sorting of lap times

I'm working on a content management system about Formula 1. At the moment I try to find out how I can sort lap times.

At the moment also the first test drives will take place. Today is the case that a driver was driven without a lap time, but he has 3 laps.

If I entries the lap times into my system then the driver is on the first place and not on the last place.

How I can sort it that a driver is on last place if he has no lap time, but the other laptimes will sort after the fastest one?

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