Ospreys passed up a golden opportunity to climb back into the Guinness Pro12 play-off places as a final-minute Jimmy Gopperth penalty sealed a 9-9 draw for Leinster at the Liberty Stadium.
The hosts were 9-6 up going into the final 90 seconds, when replacement Morgan Allen was penalised in his 22 at a ruck. Gopperth stepped up and put the ball through the posts to claim his third penalty and give the visitors a share of the spoils.
Meanwhile, Ulster made it four Guinness PRO12 wins in succession to move level with Glasgow at the top of the table, downing Scarlets 25-20 in a hard-fought match.
Tries from Craig Gilroy, Luke Marshall and Ruan Pienaar got Ulster the four points with the South African ending up with 15 points from the final total.
However, Neil Doak's men will be disappointed not to have bagged a bonus win on the night with Kristian Phillips' late try denying them outright leadership of the league.