diff --git a/visualdev/Tnb.Vengine/AppService/VmodelAppService.cs b/visualdev/Tnb.Vengine/AppService/VmodelAppService.cs
index 77be98da..2ecf9373 100644
--- a/visualdev/Tnb.Vengine/AppService/VmodelAppService.cs
+++ b/visualdev/Tnb.Vengine/AppService/VmodelAppService.cs
@@ -100,6 +100,7 @@ public class VmodelAppService : VengineAppService<Vmodel>, IVmodelAppService
         Vmodel vm = input.data.Adapt<Vmodel>();
         vm.areaCode = vm.areaCode.ToKebab();
         vm.vmCode = vm.vmCode.ToKebab();
+        vm.navProps.ForEach(a => a.naviModel = null);
         await _db.Updateable(vm).WhereColumns(a => a.id).ExecuteCommandAsync();
         return input;
     }
diff --git a/visualdev/Tnb.Vengine/Domain/VmNavProp.cs b/visualdev/Tnb.Vengine/Domain/VmNavProp.cs
index 203f251b..ae6d0957 100644
--- a/visualdev/Tnb.Vengine/Domain/VmNavProp.cs
+++ b/visualdev/Tnb.Vengine/Domain/VmNavProp.cs
@@ -51,7 +51,7 @@ public class VmNavProp : VmBaseProp
     //[JsonIgnore]
     //public string? midTable { get; set; }
 
-    [JsonIgnore]
+    [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
     public Vmodel? naviModel { get; set; }
 
     #endregion Properties