Attempt to index nil with 'UpperTorso'

I found out what it is and I need help,
What it is the script keeps running therefore it keeps teleporting you to the spawn, that causes it to freak out and glitch out the map. (it runs until the 15 seconds are over) So how can I make it run once. Other than that you were the solution

Nevermind I fixed it by changing the if 1 then to if countdown.Value == 1 then