Backfire

I used my Husqvarna YTH24v48 tractor last night for the first time. It has a B&S 24Hp Intek engine on it. It ran great but after about an hour of I shut it down and it backfired one time. It restarted fine and ran fine for another 30 minutes until I was done. Is this something to be concerned with?

It didn't backfire again when I was done for the night so it has only done it one time. Just checking to see if there is anything to be concerned about.

Thanks