The hosts could have snatched victory in the last action of the game but Michael Gregoritsch's point-blank header was saved by Lukas Hradecky.
German police arrested a man on Friday who is suspected of planting explosives targeting the bus of soccer team Borussia Dortmund last week, the office of the German federal chief prosecutor said.
Islamist arrested over Dortmund bus attack was IS member in Iraq
Teenager Kylian Mbappe scored twice to give AS Monaco a 3-2 win at Borussia Dortmund on Wednesday in a Champions League quarter-final first-leg match that was postponed following an attack on the home team's bus.
Depleted Borussia Dortmund shrugged off the absence of more than half a dozen starting players to ease into the German Cup quarter-finals with a comfortable 2-0 win at third-tier Saarbruecken on Tuesday.
'Until I was on the pitch in the second half, I didn't think about football'
Bayern Munich beat Borussia Dortmund 4-3 on penalties to win the German Cup for the 18th time on Saturday, handing coach Pep Guardiola another domestic double in his final game in charge.
Bayern Munich went top of the Bundesliga with a 1-1 draw at Bayer Leverkusen on Saturday as rivals Borussia Dortmund slumped to their first defeat of the season with a 2-0 reverse at Borussia Moenchengladbach.
Angel Correa saw La Liga leaders Atletico Madrid snatch a 2-1 victory away to Granada on Saturday
A summary of Tuesday's matches in the UEFA Champions League.
All the latest football news from around Europe.
Karim Benzema came off the bench to score 13 minutes from time and ruin any chance of a dream result for resilient Ludogorets as holders Real Madrid carved out a patchy 2-1 win in Wednesday's Champions League Group B match.