diff --git a/system/Tnb.Systems/System/DataInterfaceService.cs b/system/Tnb.Systems/System/DataInterfaceService.cs
index 9ca5c55b..15af8000 100644
--- a/system/Tnb.Systems/System/DataInterfaceService.cs
+++ b/system/Tnb.Systems/System/DataInterfaceService.cs
@@ -326,11 +326,11 @@ public class DataInterfaceService : IDataInterfaceService, IDynamicApiController
         }
         VerifyRequired(info, dicParameters);
         ReplaceParameterValue(info, dicParameters);
-        if (info.DataType == 1)
+        if (info?.DataType == 1)
         {
             output = await GetData(info);
         }
-        else if (info.DataType == 2)
+        else if (info?.DataType == 2)
         {
             output = info.Query.ToObject<object>();
         }
@@ -338,7 +338,7 @@ public class DataInterfaceService : IDataInterfaceService, IDynamicApiController
         {
             output = await GetApiDataByTypePreview(info);
         }
-        if (info.DataProcessing.IsNullOrEmpty())
+        if (info is null || info.DataProcessing.IsNullOrEmpty())
         {
             return output;
         }
@@ -897,8 +897,8 @@ public class DataInterfaceService : IDataInterfaceService, IDynamicApiController
     private async Task<JObject> GetApiDataByTypePreview(DataInterfaceEntity entity)
     {
         var result = new JObject();
-        var parameters = entity.RequestParameters.ToObject<List<DataInterfaceReqParameter>>();
-        var parametersHerader = entity.RequestHeaders.ToObject<List<DataInterfaceReqParameter>>();
+        var parameters = entity?.RequestParameters.ToObject<List<DataInterfaceReqParameter>>() ?? new List<DataInterfaceReqParameter>();
+        var parametersHerader = entity?.RequestHeaders.ToObject<List<DataInterfaceReqParameter>>() ?? new List<DataInterfaceReqParameter>();
         var dic = new Dictionary<string, object>();
         var dicHerader = new Dictionary<string, object>();
         dicHerader.Add("JNPF_API", true);
@@ -914,7 +914,7 @@ public class DataInterfaceService : IDataInterfaceService, IDynamicApiController
             dicHerader[key.field] = key.defaultValue;
         }
 
-        switch (entity.RequestMethod)
+        switch (entity?.RequestMethod)
         {
             case "6":
                 result = (await entity.Path.SetHeaders(dicHerader).SetQueries(dic).GetAsStringAsync()).ToObject<JObject>();