at the risk of (doing something)
Said to acknowledge that what one is about to say or do could (and probably will) have a particular negative result (which is stated after "of"). At the risk of sounding stupid, who was the second president of our country?
at the ˈrisk of doing something
used to introduce something that may sound stupid or may offend somebody: At the risk of showing my ignorance, how exactly does the Internet work?