Question about interaction w/ Sr. Developer

For context, I am a Jr. Developer and we are finishing up a project and the task is to double-check everything prior to sending out deliverables.

Sr. Is reviewing the project and lets me know that there is a bug in the application. (To me, it seemed like they were asking me to fix it)

After I reviewed the bug, I saw that the problem was in the code that they wrote. I decided to let them know that the problem was in their code and advised them to fix it to their liking.

Was I wrong for responding that way?