Seems to be an endless loop. The first couple will pass and then Stacia is in the city, then after a few dialogues this error loops. I must have pressed Ignore close to 100 times.
This happens as soon as the first Stacia scene ends. Since it is referring to the brothel, I am wondering if it is related to the brothel not being visited or open yet? What I did was install the latest update and fast travel on Magna, and no other events or characters.