 On 1 November 1983, he was suspended for three months by the Swiss Football Association when he didn't abandon a match in first Swiss League (Kuesnacht vs Duebendorf, 17 September 1983).On 27 September 1989, when refereed the UEFA-Cup match between Ajax and Austria Vienna, he abandoned the match in the 104th minute (score 1–1) after an iron bar was thrown at Vienna's goalkeeper, Franz Wohlfahrt.Galler also refereed a German Bundesliga match between Borussia Dortmund and Waldhof Mannheim (2–0) on 30 March 1990.