Fix it, or change up the pattern. I encountered this on my son's scarf, I did one row of crosses 2 rows too late. I just left it saying OK, that marks the middle of the scarf (which will be at the back of his neck anyhow). If it wasn't in that spot, I might would have said OK, 3 short cables, 1 long cable, 3 short cables, 1 long cable, etc.
And I would adamantly swear I had to "make a small mod to the pattern as I was unhappy with the redundant even-ness of the project and had to change it up to express myself" :mrgreen:
Unless I really didn't like it. Then I would just do a lifeline and smack it back however many rows anyway. ETA- I would try the fix method first though- that would be really cool to learn!