diff --git a/AsbCloudInfrastructure/Repository/WellOperationRepository.cs b/AsbCloudInfrastructure/Repository/WellOperationRepository.cs
index d4cff5da..69740a37 100644
--- a/AsbCloudInfrastructure/Repository/WellOperationRepository.cs
+++ b/AsbCloudInfrastructure/Repository/WellOperationRepository.cs
@@ -226,25 +226,25 @@ namespace AsbCloudInfrastructure.Repository
                     DeltaDepth = g.Sum(o => o.DurationDepth),
                     IdParent = parentRelationDictionary[g.Key].IdParent
                 });
-            var defaultId = 0;
-            while (dtos.Any(x => x.IdParent == null))
+            
+            while (dtos.All(x => x.IdParent != null))
             {
-                defaultId--;
                 dtos = dtos
-                .GroupBy(o => o.IdParent)
-                .Select(g => new WellGroupOpertionDto
-                {
-                    IdCategory = g.Key ?? defaultId,
-                    Category = g.Key.HasValue
-                        ? parentRelationDictionary.GetValueOrDefault(g.Key.Value)?.Name ?? "unknown"
-                        : "unknown",
-                    Count = g.Sum(o => o.Count),
-                    DeltaDepth = g.Sum(o => o.DeltaDepth),
-                    TotalMinutes = g.Sum(o => o.TotalMinutes),
-                    Items = g.ToList(),
-                    IdParent = g.Key.HasValue
-                        ? parentRelationDictionary.GetValueOrDefault(g.Key.Value)?.IdParent ?? defaultId
-                        : defaultId,
+                .GroupBy(o => o.IdParent!)
+                .Select(g => {
+                    var idCategory = g.Key ?? int.MinValue;
+                    var category = parentRelationDictionary.GetValueOrDefault(idCategory);
+                    var newDto = new WellGroupOpertionDto
+                    {
+                        IdCategory = idCategory,
+                        Category = category?.Name ?? "unknown",
+                        Count = g.Sum(o => o.Count),
+                        DeltaDepth = g.Sum(o => o.DeltaDepth),
+                        TotalMinutes = g.Sum(o => o.TotalMinutes),
+                        Items = g.ToList(),
+                        IdParent = category?.IdParent,
+                    };
+                    return newDto;
                 });
             }
             return dtos;
diff --git a/AsbCloudWebApi/Rest/WellOperation.http b/AsbCloudWebApi/Rest/WellOperation.http
new file mode 100644
index 00000000..37dd8e2c
--- /dev/null
+++ b/AsbCloudWebApi/Rest/WellOperation.http
@@ -0,0 +1,12 @@
+@baseUrl = http://127.0.0.1:5000
+@contentType = application/json
+@auth = Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCIsImN0eSI6IkpXVCJ9.eyJpZCI6IjEiLCJodHRwOi8vc2NoZW1hcy54bWxzb2FwLm9yZy93cy8yMDA1LzA1L2lkZW50aXR5L2NsYWltcy9uYW1lIjoiZGV2IiwiaWRDb21wYW55IjoiMSIsImh0dHA6Ly9zY2hlbWFzLm1pY3Jvc29mdC5jb20vd3MvMjAwOC8wNi9pZGVudGl0eS9jbGFpbXMvcm9sZSI6InJvb3QiLCJuYmYiOjE2NjI1NDgxNjIsImV4cCI6MTY5NDEwNTc2MiwiaXNzIjoiYSIsImF1ZCI6ImEifQ.OEAlNzxi7Jat6pzDBTAjTbChskc-tdJthJexyWwwUKE
+
+@wellId = 1
+
+### 
+GET {{baseUrl}}/api/well/{{wellId}}/wellOperations/groupStat
+Content-Type: {{contentType}}
+accept: */*
+Authorization: {{auth}}
+