He wrote: "While I was checking the FC Taxi players' ID, a small child was doing warm-up exercises alongside the players.
The German official was due to take charge of Sunday's clash between FC Taxi II and Rot-Weiss Mulheim III.
Kahler said in his report that he had been attacked by one of the FC Taxi players' children.
FC Taxi had previously shown bite of a different kind, climbing to third in the regional Kreisliga C table.
The clash between FC Taxi II and Rot-Weiss Mulheim III will be rescheduled for later in the season.
