Chelsea goalkeeper Robert Sanchez was criticised for his poor error against Wolves with Jamie Carragher declaring him only good enough for a 'bottom half' club.
Sanchez dropped Matheus Cunha's corner delivery in first-half stoppage time, allowing Matt Doherty to stab home the equaliser from close range.
The Blues had taken the lead through Tosin Adarabioyo, the defender applying the finishing touch after a deflection, and looked in cruise control at Stamford Bridge.
But the visitors hit back on the cusp of the interval after winning a corner on the right-hand side, which Cunha whipped in toward the front post.