Play was stopped for more than half an hour after several supporters were injured during the incident.
Sunday's La Liga meeting at El Sadar between Osasuna and Real Betis was temporarily suspended after a barrier collapsed in the stands.
Osasuna, needing a win to have any chance of retaining its La Liga status, went ahead in the 12th minute of the game in Pamplona through Oriol Riera.
However, trouble followed in the ensuing goal celebrations. The home supporters behind Betis' goal proceeded to react with understandable elation, but a section of a protective barrier keeping fans in the stands collapsed.
Numerous supporters spilled over the edge and on to the area of the pitch behind the goal and advertising hoardings, although the extent of any injuries suffered is not immediately clear.
Security officials and medical staff quickly attended the scene and, after the injured were taken off the field - with the help of Betis midfielder Alfred N'Diaye – the rest of the barrier was momentarily removed.
Play then continued after a break of more than half an hour.