Niko Kovac believes there is little cause to panic, after his side lost their first game of the season to Hertha Berlin.
Ibisevic opened the scoring from the spot, before Duda made sure of the win with a close range finish.
Bayern’s last game was an underwhelming 1-1 draw against Augsburg, but Kovac sees no reason to be worried.
“Not only did we not take our chances but we conceded two avoidable goals. That must not happen,” the Bayern boss told reporters.
“For the second goal we made a tactical mistake. Mistakes happen, but if you make them in the Bundesliga you will be punished.
“I thought we played a decent game overall, but the result makes it difficult to justify that. We combined well and controlled the game but we just didn’t take our chances.
“[Losing] is not a problem at all. Those who know Bayern know we will not put up with it easily.”
The result ended a run of 14 league meetings without a win for Hertha against Bayern.