Real Sociedad ended Barcelona's run of wins, but the Blaugrana remain top of LALIGA.
Barcelona struggled for much of the encounter, and even a late flurry of sustained attacks could not help them stave off a deserved defeat, as they were beaten 1-0 by a gutsy Real Sociedad.
Just before the match, the Blaugrana announced that Lamine Yamal was ruled out due to injury and Barcelona's chances of making it eight victories in all competitions took a dive.
However, they were still expected to win given their incredible form, but a determined Real Sociedad with an impeccable game plan by Imanol Alguacil, halted Barcelona in their tracks and inflicted their second defeat in the league.
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Key match details
Barcelona were the brighter team in the opening exchanges and thought they had secured an early goal for all of their troubles when Robert Lewandowski expertly finished, only to see his goal ruled out for a marginal offside.
Momentum swung from that point on, as Real Sociedad gradually played their way into the contest, testing Inaki Pena with multiple attempts.
Sociedad's relentless pressure paid off in the 33rd minute, as Luka Sucic's clever flick-on found Sheraldo Becker, who clinically converted into the far corner.
Determined to capitalise on their home advantage, Sociedad resumed the second half with renewed intensity. However, Pena again came to Barcelona's rescue, denying Oyarzabal's close-range effort.
As the match entered its final stages, Ander Barrenetxea wasted another promising chance for Sociedad, his scuffed strike veering narrowly wide.
The hosts' profligacy kept Barcelona's hopes of a late equaliser alive, but despite dominating possession in the closing stages, the visitors were sterile, failing to display the offensive potency they have been synonymous with, as they fell to their second defeat of the league campaign.