The fly-half missed four of his six attempts at the posts during the 13-6 loss at The Stoop last night.
The team's director of rugby told Sky Sports News: "You get the bounce of the ball one day, you don't the next. We move on and forget it. Nick wins so many games for this club.
"We brought Ben Botica on and he hit the posts but, if we play like that week in week out, we'll be fine. We just have to take our chances and we had enough.
"It's disappointing because I thought we played some really good rugby in horrific conditions but we didn't get the rewards. I said to the boys, even before the game, this doesn't define your season."
Northampton sit at the top of the table, having won their opening two matches of the season.