diff --git a/Shoko.Server/API/v3/Controllers/TreeController.cs b/Shoko.Server/API/v3/Controllers/TreeController.cs
index f89fddb52..69446b529 100644
--- a/Shoko.Server/API/v3/Controllers/TreeController.cs
+++ b/Shoko.Server/API/v3/Controllers/TreeController.cs
@@ -455,7 +455,7 @@ public ActionResult<List<Group>> GetSubGroups([FromRoute] int groupID, [FromQuer
                     return false;
                 }
 
-                return includeEmpty || group.GetAllSeries()
+                return includeEmpty || subGroup.GetAllSeries()
                     .Any(s => s.GetAnimeEpisodes().Any(e => e.GetVideoLocals().Count > 0));
             })
             .OrderBy(group => group.GroupName)