Barcelona picked up a 1-1 draw in the Champions League clash with Napoli on Tuesday night.
Napoli's Dries Mertens opened the score in the 30th minute, but Barcelona's Antoine Griezmann scored an equalizer already in the beginning of the second half.
During the game Blaugran's stopper Marc-Andre ter Stegen was caught on camera shouting at Nelson Semedo to look out for corner that was taken quickly afterwards.
The Catalan giants appear to learn from their mistakes, as in the previous Champions League campaign in the clash against Liverpool they conceded a goal from the corner which saw them getting out of the tournament.