Error when trying to track test (very) fast cars

I get an error when I try to track test fast cars. It seems to be cars that have a 0-100 of near 4 seconds and below.
After the error, the game still works except you can't track test anything until you restart the game.
It says lua Error
428: attempt to perform arithmetic on field '?' (a nil value)
After the error, the game still works except you can't track test anything until you restart the game.
It says lua Error
428: attempt to perform arithmetic on field '?' (a nil value)