Kelly Clarkson has been mysteriously absent from her talk show The Kelly Clarkson Show for a few weeks now, with a variety of star guest hosts filling in for her in recent episodes.

The singer hasn’t publicly addressed her absence, and there’s been no official word on what prompted it.

But an unnamed source recently told Entertainment Tonight that Clarkson unexpectedly had to leave her show due to a “sudden family emergency.” The outlet also reports that the fill-in hosts — who were originally booked to appear as guests on her show — didn’t know ahead of time that Clarkson wouldn’t be there “due to privacy reasons.” When they arrived on set, they were offered the option to guest host.

According to a timeline laid out by People, Clarkson was absent on March 3, and actor Simu Liu filled in for her. She was back on March 4, and didn’t address the switch-up to the audience. She hosted on March 5, but on March 6, she was gone again — this time with comedian Roy Wood, Jr. filling in.

None of the guest hosts revealed why Clarkson was absent. Liu briefly shared, “Kelly actually isn’t able to make it today. We are sending her our very best, and here’s the thing: I did not know that I was doing this until about five minutes ago when I arrived here to promote my new movie, ‘Last Breath.’”

The singer continued to miss tapings, with a rotating cast of stars hosting the show on March 7 and March 11, March 13 and March 14.