A weekly look at what the Minnesota Vikings must fix:

On their final defensive series in their 17-16 loss to the Buffalo Bills on Sunday, the Minnesota Vikings allowed 91 passing yards, including 22 after the catch. They gave up 130 yards after the catch Sunday, according to ESPN Stats and Information, and are 20th in the league in limiting gains after the catch this season.

Although they'll face the league's worst after-the-catch team this weekend, the Vikings can't afford to let the Tampa Bay Buccaneers get their offense going on broken plays.

For all his impressive moments in what's been an outstanding rookie season, linebacker Anthony Barr might be the Vikings' biggest culprit in allowing gains after the catch. According to Pro Football Focus, no player has allowed more yards after the catch than the 256 Barr has given up this season. Although he's proven to be a force against screen passes, as he can read and react, he's still learning how to make open-field tackles after dropping back in pass coverage. The Bills ran a number of shallow crossing routes designed to get their receivers matched up against Barr in coverage; they targeted him 13 times on Sunday and completed 11 passes that saw their receivers gain 66 of their 92 yards after the catch. Pass coverage is the only part of the game in which Barr still looks like a rookie, and the Vikings will have to go through the learning process with him, but the sooner he develops, the quicker they'll likely be able to limit gains with the ball in a receiver's hands.