Peloton, the exercise bike company, closed its first day of trading down 11.2% on Thursday.

Chalk that up to heightened investor anxiety around IPOs lately (Uber and Lyft have struggled, WeWork delayed its IPO, Endeavor shelved its IPO); or to diminishing appetite for companies that are not profitable; or to overall market jitters. (Thursday was a down day amid impeachment inquiry proceedings in Washington.)

But if all that isn’t enough, Peloton (PTON), which has 1.4 million paying members, is also dealing with a pesky legal issue: a big lawsuit over the company’s use of music in its classes.

Peloton disclosed music rights as a risk factor in its S-1 filing back on Aug. 28. But risk factors don’t usually worsen this quickly.

The company was already being sued by the National Music Publishers Association for $150 million before it announced its intention to go public. That lawsuit, filed in March, is over its use of songs from artists including Drake, Rihanna and Ariana Grande. The lawsuit alleges that Peloton is a “textbook willful infringer.”

In response to the suit, in March, Peloton said it would remove the unlicensed songs from its workouts, which is not a great solution for riders. CEO John Foley wrote in an email to members, “While you may notice this in the near term, I can assure you that this will not affect your experience with (or the cost of) our service, or access to the kind of music you’re used to hearing behind our instructors in the thousands of classes in our library.”

In April, Peloton filed a countersuit, accusing the NMPA of anticompetitive behavior. The countersuit insists, “Peloton is not the bad actor that Plaintiffs portray it to be.”

Then, days before the IPO, the same music publishing group discovered another 1,000-plus songs it says Peloton used in classes without permission, from artists including Beyonce, Britney Spears, Bruno Mars, Lizzo, and Taylor Swift, so the NMPA doubled the damages in its lawsuit.

So now we are talking about a $300 million lawsuit for a company with $915 million in annual revenue—not insignificant. And additional legal action could certainly follow. Music licensing is now a major vulnerability for this hot brand.

You have to wonder how Peloton, launched in 2012, lasted this long without getting its music licensing in order.

“We depend upon third-party licenses for the use of music in our content,” Peloton said in its S-1. “An adverse change to, loss of, or claim that we do not hold necessary licenses may have an adverse effect on our business, operating results, and financial condition.”