As I was pushing the conductors, (new 12/2) back into the box after wiring a receptacle, I noticed an apox. 1/4" clean slit in one of the neutral's insulation. All the other conductor's insulation was perfectly intact. As I didn't have enough wire to cut back past this defect, I thoroughly wrapped it tightly with several go a rounds of white electrical tape. So, is this an OK thing to do?