diff --git a/src/main/angular/src/app/api/group/Group.ts b/src/main/angular/src/app/api/group/Group.ts
index 547aace..4def01d 100644
--- a/src/main/angular/src/app/api/group/Group.ts
+++ b/src/main/angular/src/app/api/group/Group.ts
@@ -36,7 +36,7 @@ export class Group {
   }
 
   usersByNameOwnerFirst() {
-    return this.users.sort(this.compareOwnerFirstThenName);
+    return this.users.sort((a, b) => this.compareOwnerFirstThenName(a, b));
   }
 
   private compareOwnerFirstThenName(a: UserPublic, b: UserPublic): number {