Played behind closed doors, the result lifted Hertha one place up to 10th on 34 points from 27 games while promoted Union, who won the reverse fixture in November 1-0 thanks to a late penalty, stayed 12th on 30 points.
Salomon Kalou scored a hat-trick as Hertha Berlin beat Hanover 96 3-1 on Friday, their second win in three matches helping them climb to fourth in the Bundesliga.
Steinhaus, a 38-year-old police officer, has been a German FA referee since 1999 and taken charge of 80 second division matches since 2007.
The Ivorian apologised for his behaviour which the German Football League described on Twitter as "absolutely unacceptable" and which some media suggested could even hamper the Bundesliga's hopes of re-starting after the coronavirus outbreak.
Giacomo Bonaventura's free kick earned Milan a 1-0 win over Pescara to move them into the top three of Serie A on Sunday.
A round-up of Saturday's action in Serie A, La Liga and Bundesliga.