The joint Usher and Chris Brown R&B Tour has pulled the plug on two upcoming stadium dates: a Monday, November 16 performance at SoFi Stadium in Inglewood, California, and a Sunday, December 6 show at Miami's Hard Rock Stadium, as reported by Complex.

TMZ, which first spotted the Los Angeles cancellation, says a screenshot from a ticket holder's Ticketmaster account showed the SoFi event marked "CANCELED," with fans notified they will be refunded.

Ticketmaster's notice tells ticketholders they do not need to take any action and that refunds should arrive within 14 to 21 days, according to InMusic Blog. Neither Ticketmaster's listing nor the organizers have stated a reason for the cancellations.

The timing fuels rumors of a rift between the co-headliners.

TMZ reports the tension stems from a heated backstage argument at their Atlanta show, where Usher wanted to start on time while Chris Brown wanted to delay so fans stuck in traffic could get inside — a disagreement that pushed the concert back nearly three hours.

A source described to TMZ as saying the two have yet to sit down and hash things out, with their relationship still "icy."

The scrapped shows are not the tour's first casualties.

Complex reports organizers canceled four October stops — Baltimore on Oct. 17, Cincinnati on Oct. 24, Columbia, South Carolina on Oct. 29, and Indianapolis on Oct. 31 — with a statement citing the promoter's decision to "prioritize the health and well-being of the touring party and crew" amid the demands of a tour of this length and scale.

Complex notes the October cancellations came ahead of Brown's sentencing in the UK, where he received an eight-month suspended sentence after pleading guilty to affray over a nightclub attack. It remains unclear whether the LA and Miami cancellations share that rationale.

The stakes are unusually high because this is the first time Usher and Chris Brown have shared a full concert run, per InMusic Blog: a trek that launched June 26 in Denver as a 33-date stadium tour, expanded to 59 shows across 26 stadiums in the US and Canada, and closes December 12 in Tampa.

InMusic describes a nine-act, 50-plus-song production with the two alternating performances and sharing moments on songs like "Party" and "New Flame." A lingering feud between two generations of R&B stars now threatens whether that collaboration reaches the finish line.

For now, most of the tour remains intact. Complex reports the remaining dates, including stops in Atlanta, New Orleans, Houston, and Tampa, appear unaffected.

Whether the pair patch things up or more dates vanish is unresolved; as TMZ framed it, time will tell if there is still "Something in the Water" between them or "Love in This Club."