Arsenal's pre-season got off to a slow start in Scotland after Mikel Arteta's side were surprisingly beaten by Hibernian at Easter Road.
The Gunners fielded a starting XI of mainly first-team players, handing first senior starts to 19-year-old keeper Arthur Okonkwo and centre-back Harry Clarke.
Yet it was Okonkwo's terrible error in the first period that gave Hibs a first half lead in the 21st minute.
The keeper's attempt to clear a bouncing backpass saw him volley at thin air, allowing Martin Boyle to steal in and roll the ball home.