The 19-year-old, who is on loan from Manchester City, was presented with an open net to score last season when the Hoops were trailing 1-0 in the game, but he only managed to hit the side netting.
"You don't worry about that too much," Roberts said ahead of the weekend's clash with Celtic's fierce rivals.
"It doesn't faze me. It was a bad miss and it happens in football, it happens all the time. I tried to do it too perfect and it didn't come off. Next time that will be in the back of the net.
"I learned from the last game. That was quite intense. I thoroughly enjoyed that. I can only improve every game and I will go into this game even better than I was then."