Studs can look great, but they do tend to fall out or break.  Carefully take the stud off and put a piece of fabric behind the hole and bond and darn.  If you have been able to get the stud out without creating too much of a hole, you can put a buttonhole on the top section, and nice buttons that look like studs.

There is a heavy fabric you can buy with iron on on the back of it.  It comes in white and I recently repaired a pair of shorts, taking the studs off, then I unpicked the flap section and inserted this over the top of the holes.

Use your imagination with repairs.  The fashion today allows for just about anything.  Particularly with jeans.

Happy sewing

Judith aka genie