The 10 people still working on it were lucky to escape without injury but no one was hurt and Guetta was expected to reschedule.

Show promoter Vojislav Nesic said police were called to the park area of the old Kelemegdan fortress and there’s an ongoing investigation into how the roof collapsed.

He said he’s still counting up what his company has lost on the show but above all he’s pleased to have had such a lucky escape.

“I don’t know if the fault was caused by the equipment, the construction or human error but my son and I were standing on the stage 10 minutes before the roof came down,” he told Pollstar.

He said the combination of the shock and losing the event at such short notice resulted in him spending two days in bed.

At press time it wasn’t possible to get comment from Milenko Škariÿ, managing director of Skyline Solutions, whose company was responsible for the show production.