Nicki Minaj and Cardi B attend the Harper’s Bazaar party at The Plaza in New York last Friday. Things are getting ugly, the writer says. AP

Nicki Minaj reportedly flew all the way to China to perform at a festival that was allegedly a scam.

The American rap star headed to perform a 90-minute set at the Djakarta Warehouse Project China festival but subsequently learned that the event wasn't as it had been advertised, Shanghaiist reports.

The festival was originally billed as a spin-off of the Djakarta Warehouse Project (DWP), which takes place in Bali, Indonesia.

But just prior to the event taking place, the company behind the Indonesian festival slammed the credibility of the event in China, saying that the use of its branding was "unauthourised".

In a statement issued via BuzzFeed, DWP explained: "The event rumoured to take place in Shanghai on 17th and 18th of November 2018 is an unauthorized use of DWP trademark.

"DWP as a brand, has no association with the event."

The event still took place but Nicki did not perform - much to the displeasure of the fans, some of whom had spent more than $400 on their ticket.

In a video recorded by a fan, Nicki promised to return to Shanghai with a "better partner".

The outspoken rap star explained: "I'll be back you guys for my real fans, in Shanghai, in China. I love you so much.

"And I'll be back with a better partner this time, okay?"

Meanwhile, Nicki recently claimed her critics are waiting to see her "fall".

The outspoken star - who was involved in an altercation with rap rival Cardi B during New York Fashion Week earlier this year - claimed that some people hope she is soon usurped as the most popular female rapper in the music industry.

Nicki explained: "I've been at the top of this totem pole for a very long time. Sometimes people just want to see someone who's been at the top fall, just to see if it can happen."