Simon Mignolet's howler helped West Brom climb into third place in the Barclays Premier League table as they beat Sunderland 4-2.
The Black Cats keeper gifted Shane Long the simplest of opportunities to fire into an empty net two minutes before the break when he allowed Chris Brunt's pass to squirm from his grasp.
Steve Clarke's men were already leading through Zoltan Gera's superb strike on the half-hour, and although the home side launched a fightback when Craig Gardner's 73rd-minute free-kick was deflected home, substitute Romelu Lukaku's late penalty looked to have sealed a fourth successive win for the first time in the Premier League.
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