Post Malone has fans concerned after nearly falling apart on stage.

The chart-topping singer was performing his single “I Fall Apart” during his “Runaway Tour” at the Bridgestone Arena in Nashville on Wednesday when he appeared to break down on stage. In the video clip, which went viral on social media, Post fell to the ground before tumbling over himself. His voice wavered as he struggled to get back up.

Fans took to Twitter to express their concern after seeing the alarming video. “These clips of Post Malone are disturbing and it’s breaking my heart dude wow,” tweeted one fan, while another added, “I hope he gets the help he needs if he’s hurting. I’d hate to see anything happen to him.”

However, another fan noted that this could have been part of this particular performance and that Post regularly gets low to the ground when he performs. He seemed to be doing fine later in the evening. A video shows him speaking to fans and signing autographs after the show.

In his recent GQ Style cover story, Post addressed the drug-related deaths of his peers including Mac Miller, Lil Peep, and Juice WRLD. “That could have been me,” he said.

He was also asked whether he was getting help for his mental health problems. “I am, now–I’m trying,” he said. “It’s difficult. Through my songs, I can talk about whatever I want. But sitting here, face-to-face, it’s difficult.”

Post is currently on his “Runaway Tour,” which runs through March 21. He also plans to release a new album before the year is over.