Not a thing other than you are a Catholic who actually has and uses a rosary. I have broken my share of rosaries. It you don’t use them you don’t break them. I would advise against superstition here. That would be going in the wrong direction. Fix it or buy a new one. I fixed a lot of them - still have some broken ones in a cloth bag in my drawer. I found that wooden bead ones are a little tougher, or prayer ropes are great (lost one in a lake swimming this summer, forgot to remove it) - and not wearing rosaries, just praying on them, cuts down on breaking potential significantly. I broke one on my bike handle while riding (it fell forward from under my sweatshirt or whatever). Crazy. It was actually probably a good thing I stopped wearing it on the bike, and emerged otherwise unscathed from the mishap.