Jose, what do you do when the sheet music is wrong, do you play it the right way or do you play as is for fear that the singer will get screwed up?
Well, sometimes you don't know it's wrong until your/I'm playing that measure. And sometimes "wrong" is more a case of the sheet music being "not fully correct" - if that makes sense. Sometimes it's a matter of a chord voicing that was rearranged when it came time to publish the music. And sometimes, the original version of the song provided by the composer for publication does not match the recorded version(s) of the song.
Otherwise, I keep playing. Whether it's the music's mistake or mine.
And as I always advise (and caution) singers... The people behind the table are listening to the singer/you, not the pianist/me. As long as you know what you're doing, then everything else should take care of itself.
...And then there are those moments - and I had a few of these today - where the singer brings his/her music to you and says, "I've never heard this with piano before."
Hmmm... Ah, well.. Someday they'll learn either to actually practice their music BEFORE coming to the auditon... or just
not to volunteer that information.