( CNN ) -- Borussia Dortmund 's German title defense suffered a big blow on Saturday with a controversial 3-2 home defeat by Wolfsburg . It left Jurgen Klopp 's third-placed team , seeking a third successive Bundesliga crown , 14 points behind runaway leaders Bayern Munich . The match turned in the 35th minute when referee Wolfgang Stark ruled that Marcel Schmelzer handled the ball on the line , despite it appearing to hit him in the leg . Stark sent off the Dortmund defender and awarded a penalty that Diego converted to level the score at 1-1 . `` I 've looked at it again later and unfortunately it was an error of perception on my part , '' Stark told reporters . `` I 'm sorry , that should not happen . The penalty and the red card were a mistake on my part . That 's annoying . '' Klopp was left to rue the consequences , as struggling Wolfsburg went on to win with goals from Naldo and Bas Dost -- whose shot had earlier hit Schmelzer . `` We were 1-0 ahead and Wolfsburg had no chance and then comes the game-winning move . It was a brutal decision , '' Klopp told reporters . Bayern won 2-0 at Augsburg to move 11 points clear of second-placed Bayer Leverkusen , who travel to Hanover on Sunday . Thomas Muller opened the scoring six minutes before halftime with a penalty , his eighth goal in the league this season , after Gibril Sankoh handled Toni Kroos ' pass . Substitute Mario Gomez continued his comeback from longterm injury with the second soon after his introduction on the hour mark . The Germany striker followed up his midweek goal in the Champions League win over BATE Borisov for his third strike since starting his season late last month . Eintracht Frankfurt joined Dortmund on 27 points from 16 matches with a 4-1 win over Werder Bremen , while Schalke dropped to fifth after losing 3-1 at Stuttgart . Vedad Ibisevic scored a hat-trick as Stuttgart joined Schalke on 25 points , taking the Bosnia striker 's tally to 13 goals in all competitions this season . Freiburg moved up to eighth with a 1-0 win over bottom club Furth , while Nuremberg stayed above Wolfsburg on goal difference after beating fellow strugglers Fortuna Dusseldorf 2-0 . Hamburg ended the day seventh , having won 2-0 at home to Hoffenheim on Friday .
Referee admits he was wrong to send off Bayer Leverkusen player . Bayern Munich was red-carded for handball in 3 -2 defeat by Wolfsburg . Wolfsburg scored from penalty as champions fell 11 points behind Bayer Leverkusen . Bayern went 11 points clear of fifth -placed Bayer Leverkusen after Saturday 's win .