An near-inexplicable refereeing error during Chelsea's visit to Cardiff City once more saw match officials come under the spotlight in the Premier League.
Maurizio Sarri's men were pressed against the ropes on Sunday when the relegation-threatened hosts took the lead in the first half through Victor Camarasa.
But with "Sarri out" chants circulating through the visiting end - answered by "Sarri in" from Cardiff fans - the Blues received a reprieve.
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Cesar Azpilicueta was on hand to head the equaliser home just six minutes from time as he steered past Neil Etheridge.