Nicki Minaj interrupted her performance of “Monster” at the Essence Festival on Friday night, remarking that she doesn’t “fuck with clowns.” Kanye West’s track features what many fans think is Minaj’s best guest verse.

After performing many of his biggest hits, including “Do We Have A Problem”, “We Go Up”, “Did It On ’em” and “Beez in the Trap”, his DJ started playing “Monster”, before Minaj closes it.

“A monster anyway!” Minaj started. “A monster after all! But we don’t fuck with clowns.

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From there, she introduced Cash Money Records co-founder Birdman and Lil Wayne as her special guests for the set. They performed “#1 Stunna”, “Seeing Green”, “High School”, “Truffle Butter” and “A Milli”.

If Minaj’s comments were meant to be dissenting, it’s unclear what caused things to sour between the two artists. Some fans online have started to theorize that West’s recent collaboration with Cardi B on “Hot Shit” might be the cause.

West has yet to respond to Minaj’s performance.

“Monster” was released in 2010 and featured on the tracklist of West’s fifth studio album, My beautiful dark twisted fantasy. In addition to Minaj, the track features Jay-Z, Rick Ross and Bon Iver.

The Essence festival is set to resume on Sunday with performances from Summer Walker, The Roots and Friends, Method Man, Raekwon, Ghostface Killah, and more.

Check out Minaj’s apparent diss to Kanye West below.