A horror-show performance from Alisson condemned holders Liverpool to an FA Cup third-round replay after they were held 2-2 by Wolves on Saturday.
The Reds goalkeeper was at direct fault for the visitors' opener and leaked a soft second, as Goncalo Guedes and Hwang Hee-chan netted at Anfield.
Goals from Darwin Nunez and Mohamed Salah dug Jurgen Klopp's men out of danger between those Wolves strikes, while Cody Gakpo also impressed on his club debut.
Yet the lapses at the back proved costly for the holders, and Julen Lopetegui's visitors will feel they had their chances to claim an underdog win outright against the holders.
They certainly seized their opportunity in the 26th minute when Alisson fired a routine clearance straight to the unmarked Guedes, with the Portugal international lashing a low finish straight back past the Brazilian.
But Liverpool wrestled themselves back on the stroke of half-time after Nunez tucked home a sublime cross from Trent Alexander-Arnold with a deft volley.
Seven minutes after the interval, Gakpo helped put the hosts ahead after Salah finished his chipped ball, with the forward played onside by a botched Tote Gomes clearing header.
That looked like it could have been enough for the hosts, but Alisson was at fault again after Hwang was able to smother a tame shot past him at the left post in the 66th minute.
Hwang's goal sparked a frantic final stretch, with Wolves seeing a third goal chalked off by the linesman's flag in the closing stages, as neither could ultimately find the winner that would have avoided the need for a reunion at Molineux down the line.