Wimbledon organizers have apologized and explained that “human error” was the reason behind the electronic line-calling system being turned off during a match on Sunday.

Sonay Kartal was knocked out of Wimbledon after her Russian rival claimed the British player got special treatment when the electronic line calling failed on Centre Court. Anastasia Pavlyuchenkova, 34, recovered to knock the last British female out of the singles 7-6 6-4.

The umpire who officiated the fourth-round match that featured a controversial line call is having a “rest day” on Monday, according to the All England Club 's chief executive.

Umpire Nico Helwerth called for a point to be replayed after the ELC system malfunctioned and didn't call Sonay Kartal's out.

The All England Club said the chair umpire who faced criticism for his decision following a malfunction of the Electronic Line Calling system was merely following protocols and his absence from the schedule on Monday was due to his rest day.