...

Presentation/HushianWebApp/Service/GroupService.cs

@@ -57,14 +57,15 @@ namespace HushianWebApp.Service
             }
             return null;
         }
-        public async Task<List<Read_GroupDto>?> GetGroupsCompany(int CompanyID)
+        public async Task<List<Read_GroupDto>> GetGroupsCompany(int CompanyID)
         {
             var response = await _baseController.Get($"{BaseRoute}GetGroupsCompany?CompanyID={CompanyID}");
             if (response.IsSuccessStatusCode)
             {
-                return await response.Content.ReadFromJsonAsync<List<Read_GroupDto>>();
+                var data= await response.Content.ReadFromJsonAsync<List<Read_GroupDto>>();
+                return data==null ?new() : data;
             }
-            return null;
+            return new();
         }
         public async Task<List<Read_GroupDto>?> GetGroupsFromExperID(int ExperID)
         {