Some fans at the German Darts Championship claimed a negative role during the match between Joe Cullen and Daryl Gurney on Sunday afternoon.
Referee George Noble had called on the crowd several times to stop whistling while the players were throwing.
But the whistling continued, much to Cullen's annoyance. Then the referee too had had enough, as Noble threatened to stop the game if the crowd continued to misbehave.
Watch the incident in the video below from 12:55.