A dramatic late penalty denied St Mirren a second Old Firm win in the space of just three months.
The Buddies looked set to pick up a hard-fought victory against Rangers after Jonah Ayunga's close-range effort put them ahead just after the half-time break.
VAR was to make yet another crucial intervention in Paisley, with referee Kevin Clancy initially deeming Ryan Kent to have dived in the Saints' box under pressure from Marcus Fraser.