Everything should be ok. Not going to matter much since your growing an autoflower, especially if you’re into four-Five weeks of flower already. Photoperiods would start freaking out if this happened to them a few times.
However if this was a human error (you messed up) on the timer then just fix it and proceed. If it’s a digital timer and it messed up, chances are it will do it again and it’s time to swap that timer out.
Hope this helps.