Gassan Ahadme scored a last-gasp extra-time winner as Charlton escaped with a thrilling 4-3 FA Cup win at National League Southend.

Miles Leaburn and Zach Mitchell had put the Addicks in control during the first half but their non-league opponents fought back through a Jack Bridge penalty and Oliver Coker’s 52nd minute strike.

Matty Godden put Charlton back in front midway through the second half but Joshua Edwards’ own goal in stoppage time sent the tie to extra time.

However, it was Charlton’s turn to strike in time added on as Ahadme sent the Addicks into round two.

Leaburn headed home a left-wing cross from Josh Edwards after just nine minutes and Mitchell nodded in a free-kick from Terry Taylor with 40 minutes on the clock.

The Addicks wasted a golden chance to make it 3-0 with skipper Godden firing shot against the crossbar when clean through on goal.

Southend quickly made the most of the left-off with Bridge scoring from the penalty spot on the stroke of half-time after Coker’s cross had been handled in the box.

Coker levelled with a shot from eight yards before Godden slid the ball in from close range.

Southend again fought back but Ahadme was on target at the death following a defensive mix-up.