This isn't a good sign.

Justin Bieber's upcoming concert in Oman on May 6 has been canceled, according to Hollywood Life

It is unclear as to why the concert has been axed, although traditionally a canceled concert is a result of low ticket sales.

This nixed show in Muscat, Oman, is Justin's latest issue during what has been a turbulent world tour.

The pop star has been quite late for several of the shows, including a March concert in London and one in Germany earlier this month.

Plus, he is still dealing with any number of controversies, including his recent remarks about Anne Frank, his scuffles with photographers and neighbors, and his harsh words for Lindsay Lohan.

To accomodate his fans in Oman, the Biebs has added a second show in Dubai on May 5, which fans can swap their Oman tickets for. Or they can get a full refund.

Oman is located in the Middle East and borders Saudi Arabia.

We wonder if low ticket sales were in fact the issue, or if a different problem arose.

Either way, if you were planning to fly into Oman in May to catch a Bieber show, you may want to change your plans.

Source: Hollywood Life