AFC Wimbledon grabbed a last-gasp leveller to frustrate Pompey reserves.
A spectacular own goal from Mark Phillips appeared to have given Paul Hardyman’s men the victory at Furze Lane.
But in the 89th minute Ben Chorley felled Daniel Gallagher inside the box and David Fitzpatrick sealed a 1-1 draw.
Earlier, Bradley Tarbuck fired in a low cross from the right on three minutes to break the deadlock.
Wimbledon defender Phillips, with back to goal, somehow contrived to slice his clearance into his own net.
Pompey boss Andy Awford and his assistant Gary Waddock were not at the game.
Pompey: Poke, Tarbuck, Butler, Field, Whatmough, Chorley, Awford (Maloney), Close, Agyemang (Chaplin), Hollands, Craddock. Subs not used: Haunstrup, Granger.