Barcelona were trapped in a 2-2 draw with fourth placed Rel Sociedad in a match that appeared to be more of entertainment than a struggle to win on Saturday afternoon at the Reale Arena in San Sebastian.
A Mikel Oyarzabal goal gave the hosts the lead with a penalty conversion after Sergio Busquets fouled Diego Llorente, but Antoine Griezmann scored the leveling with a clipped finish against his former club.
Luis Suarez then put Barcelona ahead from Lionel Messi’s unselfish pass.
But Alexander Isak equalised as he fired home after Marc-Andre ter Stegen parried Nacho Monreal’s cross-shot.
Real Sociedad were probably the better team with 53% possession and 19 shots to Barca’s nine. Martin Odegaard, on loan from Real Madrid, was a key influence on the game although none of his five shots were on target.
Barca go one point clear of Real Madrid, who visit Valencia on Sunday (20:00 GMT). The old rivals meet in El Clasico on Wednesday.