Due to the COVID-19 pandemic, European top football (soccer) leagues played the final rounds of season 2019/20 without or strongly limited attendance of supporters (i.e., “ghost games”). From a sport psychological perspective this situation poses a unique opportunity to investigate the crowd’s influence on sports professionals’ behavior and performance.A total of 1286 matches - played in the top leagues of Spain, England, Germany, Italy, Russia, Turkey, Austria and the Czech Republic - were analyzed for results, points, goals, fouls, bookings and reasons for bookings and contrasted between respective matchdays of season 2018/19 (regular attendance) and season 2019/20 (“ghost games”).There are two main findings. First, the overall home advantage effect in the respective elite leagues - identified in the respective matches of the regular 2018/19 season - vanishes almost completely in the “ghost games” of the 2019/20 season. Consequently, home teams lose significantly more matches, whereas away teams win significantly more matches. Second, home teams are booked significantly more often with yellow cards for committing fouls in “ghost games” relative to regular games. Furthermore, our results provide evidence that this effect is independent on whether the home teams are leading, trailing, or drawing in score.We conclude that missing supporters in European elite football leagues dissolve the “home advantage” effect. This missing support of the “home crowd” has a significant psychological effect on the experience, behavior and performance of home teams and/or officials. The effect is evident in the awarding of yellow cards for fouls for home teams, but not for away teams. There are (at least) three possible explanations: (1) Due to missing supporters, players experience an unfamiliar reduction of arousal and drive, (2) players lack the positive support from the home crowd, resulting in increased dysfunctional aggressive behavior and/or (3) without the pressure from the ranks, referees act more objectively in their decision making.