Who's responsible for client damage

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An agent showed my house on Wednesday. I saw it later, it was in same condition. We agreed on a contract Thursday AM, and that afternoon she showed it to the buyers and their (afaik, adult) sons. I don't think they have been back. No one else has been there. I saw it yesterday, Monday. A light socket in the fixture in the master bath was broken.

One of them broke the light fixture. It may be a matter or "shoving" it back into place, but if it were that easy, I think they would have done that.

When that happened several years ago, my repairman said it was easier to replace the unit than repair that one socket.
If they don't buy the house, who's responsibility is it to fix that? Is it on me to hire someone to repair/replace and pay for it myself, or do I contact the agency or agent?

Thanks.