A seat assembly includes a seat cushion having a riser releasably secured to a floor. A seat back operatively coupled to the seat cushion pivots between seating and folded positions. A recliner is coupled between the seat back and seat cushion. Rotation of an input shaft actuates the recliner between locked and unlocked states. A lockout mechanism controls actuation of the recliner and includes a lock plate fixedly secured to the input shaft and a lock arm operatively coupled to the riser. The lock arm moves between a retracted position allowing rotation of the input shaft and actuation of the recliner when the riser is latched to the floor and an extended position wherein the lock plate abuts the lock arm preventing rotation of the input shaft and actuation of the recliner when the seat back is in the folded position and the riser is unlatched from the floor.