Rock-bottom Livingston were left cursing their luck in a 1-0 defeat at home to St Mirren.Liam Buchanan missed a great chance to put the Lions ahead in the fourth minute, striking the post with a penalty after being fouled by Jack Baird.Stephen Mallan made them pay soon after, scoring with a drilled shot from 25 yards.Jordyn Sheerin was at the hub of Livi's bid for an equaliser, with three efforts that came close to beating Jamie Langfield - but not close enough.There was confirmation that it was simply not Sheerin and the home side's day when the striker fell in the box late on. Instead of a penalty he received a yellow card for diving.