What happened in Miss Universe 2015 was not the first time to happen in an international beauty pageant where the host Steve Harvey mistakenly call Ariadna Gutierrez of Colombia as the winner instead of Pia Wurtzbach of the Philippines. In 2006, there was Mrs. World that happened St. Petersburg, Russia where the host of the competition called Mrs. Russia Sofia Arzhakovskaya as the winner while her opponent Mrs. Costa Rica, Andrea Bermudez Romero ranked 1st place.
The winning candidate was clear until the girl gave the sash and the crown to the first runner up and had her moment in stage. The production team called the attention and need to reshoot the whole awarding like nothing happen:
Meanwhile, watch what happened earlier in the Miss Universe 2015.
Like Steve says it is live and human error may happen. As for Mrs. World the pageant continue and it will take place on March 2016.