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Former West Ham striker Jonathan Calleri's penalty helped Las Palmas hold La Liga leaders Barcelona.
The result, which extends Barca's club-record unbeaten league run to 33 games, takes Barcelona five points above Sunday's opponents Atletico Madrid.
Lionel Messi fired a free-kick into the opposite corner of the net to give Barcelona the lead.
But Calleri's excellently dispatched penalty into the top corner rescued a point for the Canary Island hosts.
Las Palmas remain in the relegation zone.
Barcelona are now unbeaten in 33 La Liga games - extending their club record.
It's all over. Las Palmas are only the sixth team to deny Barcelona a win in La Liga this season.
Las Palmas get a last-second corner. But they take it short, they're not risking this point for three.
ONE MINUTE LEFT. It's attack v defence.
Ousmane Dembele's shot from 20 yards is saved by the Las Palmas keeper, who gets up... then realises the situation and falls to the ground with the ball.
Jonathan Calleri has been booked for Las Palmas, he'll miss their next game.
Tick tock, tick tock - two minutes to go.
Philippe Coutinho finds Ivan Rakitic, who wins another corner. But it's taken short and Las Palmas get it away. Three minutes left
Lionel Messi takes the corner, the keeper punches it back out to him, and midfielder Oghenekaro Etebo - who looked injured a few minutes ago - wins the ball off him and clears.
Lionel Messi wins a corner. Send the big men up.
SIX minutes added on. Not sure why.
Three minutes to go. Are Barcelona about to drop points for only the sixth time this season? Las Palmas' players look exhausted to be honest, not sure they'll push for a winner.
Las Palmas midfielders Jairo Samperio and Oghenekaro Etebo are both injured - but they've only got one substitute left.
David Garcia replaces Samperio so Etebo will have to play on.
A load of these for Barcelona tonight, Lionel Messi tries to control the ball but just knocks it forward towards the keeper.
Oh no. Tana is in the box and he's got a chance to shoot. Instead he plays it across the box to Alen Halilovic and it's cut out.
If he'd gone alone, Barcelona's unbeaten season could have been over.
Ousmane Dembele's cross finds Luis Suarez, but his chest is far too powerful and it runs through to the Las Palmas keeper.
Jonathan Calleri comes back on with a big blue headband.
Las Palmas scorer Jonathan Calleri gets a nasty cut to the head as he was caught by Thomas Vermaelen's accidental boot.
This really isn't great for Barcelona, who have named a strong team, and aren't playing well. Real Madrid rested Cristiano Ronaldo on Tuesday and lost to Barca's neighbours Espanyol.
Meanwhile, Antoine Griezmann scored four for Atletico Madrid as they thrashed Leganes yesterday.
Barcelona bring on Ousmane Dembele for Andres Iniesta. That is not like for like. A proper pacy winger for an ageing creative midfielder.
Las Palmas replace Dani Castellano, who had a bit of a knock to the head, for Michel Macedo.
Lucas Digne has just played one of the worst crosses I've ever seen from a Barcelona player. Miles out of play.