​Any casting announcement for the upcoming Fantastic Beasts: The Crimes of Grindelwald has been extremely exciting for Harry Potter fans. But they've been scratching their heads at how the sequel could feature a character we know for a fact wasn't yet born at the time the film takes place.

Last week, it was ​revealed that Fiona Glascott would be playing a young Minerva McGonagall—a favorite character from the original Harry Potter books and movies—in the newest installment of the Wizarding World series. It was assumed we would be getting a glimpse into her life leading up to becoming a professor at Hogwarts ... but that actually wouldn't make sense.

According to ​Screen Rant, The Crimes of Grindelwald takes place in 1927, but McGonagall wasn't born until 1935. Of course, fans have taken to social media to point out this seemingly big error.

Many are now trying to figure out how McGonagall could possibly be worked into the film—possibly as a look into the future for Jude Law's Dumbledore? Others are guessing it might be another character by the name of Minerva McGonagall, but that doesn't seem likely.

It seems like this might just be a major continuity error, unfortunately, but we're waiting patiently for JK Rowling to tell us for sure. Or we'll just have to wait until The Crimes of Grindelwald hits theaters on November 16 to find out for ourselves.