diff --git a/frontend/src/components/tournament/TournamentGroupsTab.vue b/frontend/src/components/tournament/TournamentGroupsTab.vue
index c5f3cffd..46268f2a 100644
--- a/frontend/src/components/tournament/TournamentGroupsTab.vue
+++ b/frontend/src/components/tournament/TournamentGroupsTab.vue
@@ -348,7 +348,7 @@ export default {
             this.$emit('modus-change');
         },
         onMaxGroupSizeBlur(rawValue) {
-            const normalized = this.normalizeNumberInput(rawValue, { min: 1, allowEmpty: false });
+            const normalized = this.normalizeNumberInput(rawValue, { min: 1, allowEmpty: true });
             this.$emit('update:maxGroupSize', normalized);
         },
         groupRankingsForGroup(group) {