Canadian heartthrob Justin Bieber canceled a concert in Portugal in the wake not only of criticism of his professionalism but also of his almost having to close a show early because of the breathing difficulty that led to his hospitalization during his stay in the U.K.

The 19-year-old “Baby” singer was forced to abandon one of his two Portuguese concerts due to “unforeseen circumstances,” the celebrity-news site TMZ reported.

Bieber will be appearing at the Pavilhao Atlantico in Lisbon on Monday, but he will not be performing on Tuesday, according to the website Everything Is New.

In a statement posted on the site (and translated by Google Translate), it said, “Due to unforeseen circumstances, Justin Bieber was forced to cancel the second performance in Portugal, March 12.”

It continued: “The Canadian singer is eager to play for the Portuguese fans on March 11. Holders of tickets valid for March 12 should contact the respective place of purchase to receive a refund within 30 days of the date of the scheduled concert, which ends April 11.”

It’s uncertain what the unforeseen circumstances were, but they could have something to do with the singer walking around with a gas mask in England and supposedly fainting onstage due to respiratory issues last week.

However, that doesn’t exactly explain why he would be forced to cancel his second show in Portugal, as opposed to the first.

The teenage star doesn’t appear to be affected by the cancellation. He took to Twitter on Sunday to talk about relaxing and hanging out with his friends.

First, he wrote: “[S]lept good last night. hanging with the boys today. #goodtimes.” And then he added, “#sundayfunday.”

After a highly publicized breakup with Disney star Selena Gomez, the singer has seemed to be acting out of character in the public eye lately.

A pop star since he was only 14 years old, the Biebs has appeared to be struggling with his fame, as exemplified by a public meltdown on Twitter where he seemed fed up with rumors about his life.