Wycombe stumbled into the next round of the Carabao Cup as a stoppage-time own goal from Jack Simpson earned them a 1-0 win at Leyton Orient.
It was a cruel way for an evenly-matched tie to end, although one goal always looked likely to decide the match.
Demetri Mitchell had to clear a Dan Casey header off the line from a fifth-minute corner.
Cameron Stones should have marked his senior debut with a goal in the 34th minute when Wycombe broke and James Tilley fed him in space – but his effort went high over the crossbar.
The returning Magnus Westergaard almost punished Orient a minute into the second half when he pounced on a defensive mix-up, but he put his shot into the side-netting.
Tayo Adaramola sent his 86th-minute effort narrowly off target after a breakaway involving him and Azeem Abdulai that started deep in the hosts’ half.
Yet Wycombe inflicted the cruellest blow for Orient four minutes into time added on – a fine run and cross by Tilley was delivered into the area and captain Simpson could not get his feet out of the way, turning the ball into his own net.
