diff --git a/AsbCloudInfrastructure/Services/ClusterService.cs b/AsbCloudInfrastructure/Services/ClusterService.cs
index 52e4046e..d315f314 100644
--- a/AsbCloudInfrastructure/Services/ClusterService.cs
+++ b/AsbCloudInfrastructure/Services/ClusterService.cs
@@ -27,7 +27,7 @@ namespace AsbCloudInfrastructure.Services
                 .Include(w => w.Cluster)
                 .ThenInclude(c => c.Deposit)
                                 where well.RelationCompaniesWells.Any(r => r.IdCompany == idCompany)
-                                select well).AsNoTracking().ToListAsync(token);
+                                select well).ToListAsync(token); // Do not use AsNoTracking(). Next Grouping doesn't work.
 
             var gDepositEntities = wellEntities
                 .GroupBy(w => w.Cluster)