The Sociedad keeper was in the wrong place at the wrong time in the 60th minute, after Alexis Sanchez had hit the post and Gorka Elustondo attempted to clear the rebound.
In the end, the defender's clearance across goal hit Zubikarai and went straight into the back of the net.
Sergio Busquets had earlier put Barcelona ahead, before Sociedad defender Inigo Martinez was sent off for dissent during the goal celebrations.
So it was not as if the home side needed things made even easier for them. But then came the comical own goal:
image: © Will Palmer