Ghana defender Isaac Vorsah scored his second goal in as matches on Friday as his club Hoffenheim kept up their dream start to the season to claim their third-straight victory with a 2-0 win over Schalke.
Germany goalkeeper Manuel Neuer’s howler helped the home side to cement their win.
With time almost up, Hoffenheim midfielder Sejad Salihovic clattered the Schalke goalpost with a free-kick and Neuer could only watch as the ball bounced off his chest into the net, deep into extra time.
Watch Vorsah's goal against Schalke
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Earlier 22-year-old Vorsah's first-half header had given the hosts the lead.
It was his second strike in two games as his late goal against St Pauli settled his side's last match a fortnight ago.
Schalke, who have now lost all three games, gave a league debut to Ghana defender Hans Sarpei but the former Leverkuseen player was unable to stop the rot at his new club.
The result is further bad news for Schalke who will go into next week's Champions League match against Lyon with three defeats as last season's runners-up endure a nightmare start to the season.
Hoffenheim took the lead when captain Andreas Beck curled in a cross and with Vorsah unmarked in the area, the Black Star defender launched his header past Neuer.
The Germany goalkeeper had earlier kept his side in the game with several close-range saves, until his last-minute clanger, while Huntelaar squandered a golden chance to put his side ahead after only 10 minutes when he fired wide.
Kaiserslautern, Mainz, Hamburg and Hanover can all join Hoffenheim at the top of the table on Saturday as joint leaders if they win their respective matches.
Defending champions Bayern Munich take on Werder Bremen on Saturday.