There's nothing happen except lucky, Las Palmas is just lucky they can beat Barcelona in Barcelona's home. Barcelona have dominated the ball possession, shots more than Las Palmas, no red card, they've all out. Even though Barcelona didn't play with their best eleven, but the substitute players have decent qualities.
It is not wrong to say that Las Palmas won with luck, because looking at the match statistics, we can actually judge who deserves to win. But the problem is that in football dominating and creating many opportunities is not enough, because what determines whether they win or not is the number of goals they can score. Luck also cannot be obtained just like that, because Las Palmas also tried well, especially in maintaining defense and taking advantage of the opportunities they got. Although they didn't get many opportunities, once they got the opportunity they could convert it into a goal.
This is not just a matter of luck if not for their hard work and intelligence in reading Barcelona's game the club would not have won this, basically Barcelona's performance in the last few matches can be said to be not so good they experienced 2 defeats and one draw in their last five matches so this victory is not just luck Las Palmas they took advantage of Barcelona's instability in the match.