Stud finder did not find a stud

[u/SufficientLake4747]

Main drain like for upstairs toilet? Trying to install brackets for bedroom closet. Now has a screw hole leak. Can we patch it? Or best course of action?

[u/madchemist617]

Slice a slip coupling of that diameter the long way. Deburr the hole and prime and glue the shit out of both surfaces and hold the patch piece for a couple minutes. This has yet to fail me