Barcelona b slipped up again on Saturday as they twice gave up the lead as they were held to a 2-2 draw by AE Prat at the Johan Cruyff Stadium.
Alex Collado's stunning goal looked to have sent Garcia Pimienta's side into the lead at the break after good work from midfielder Riqui Puig.
However, the visitors replied before half time, Arjona drawing them level in the 42nd minute after Collado's 37th-minute opener.
Puig, though, who was impressive throughout, restored the host's lead with 12 minutes to go to put his side on track for all three points.
But Prat fought back again. Guzmán struck in the 86th minute to earn the guests a point and leave Barça B without a win in three games.
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After winning their opening game of the season, Barça have now lost one and drawn two of their last three outings and are yet to win at the Johan Cruyff stadium -- they drew their first game their 2-2, too, against Nastic two weeks ago.