It may be possible to glue the broken part back together, especially if the plastic section can be aligned cleanly and kept out of the ball joint while curing. One community suggestion was to carefully remove any plastic still stuck on the threaded part, align the broken piece in its original orientation, and glue it.

That said, the more important issue is safety. A repaired tripod leg joint is a weak point, and several responders felt it would not be trustworthy for supporting a camera. If the repair fails, even a short fall from a tabletop could damage your camera.

So the practical advice is: you can try repairing it as a light-duty fix, but it’s not a good idea to rely on it with anything valuable mounted. For actual camera use, replacing the mini tripod is the safer choice.