I may have counted one run twice in our cricket scorebook. Do I raise it after we've celebrated?

Our captain had just sent the team photo when I messaged, "I think I might have added one run twice." He replied, "It was a friendly. Don't spoil the evening over that."

I volunteered to keep our cricket scorebook because nobody else wanted the job. The captains left the ground believing we'd won by one run. At home, I had added the individual entries again and got a total one lower than the number I had put in the final box. There's an entry I may have included twice, but the handwriting is messy enough that I don't want to announce an error before checking.

The opposition also had someone recording the score. I could ask the match organiser to compare the two records and decide whether anything needs correcting. Our captain thinks contacting them now would look as though I'm accusing the players of claiming a result they knew was wrong. They didn't know; I was the person holding the book.

I want the record to be accurate, but I'm embarrassed about reopening a result everyone accepted. What would you put in the first message so it reports a possible scoring mistake without claiming certainty about either the total or what the match outcome should become?