St Johnstone boss Derek McInnes was disappointed at the lapse which enabled St Mirren to earn a Scottish Cup quarter-final replay.
"At half-time we spoke about the concentration levels needed against a SPL team and it just takes them one split-second to score." he said.
"It's tough to lose a goal when you are winning but the players did everything.
"I felt there was a real appetite from us to win the tie and from the very first minute we were terrific."
Liam Craig scored from the penalty spot after Hugh Murray upended Goran Stanic to put the Perth Saints ahead.
But Andy Dorman's equaliser brought a replay to Love Street, with the winners of the tie facing Rangers, Hibernian or Partick Thistle.
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