diff --git a/UserClass/AsyncTcpClient.cs b/UserClass/AsyncTcpClient.cs
index 3143e99..f12a075 100644
--- a/UserClass/AsyncTcpClient.cs
+++ b/UserClass/AsyncTcpClient.cs
@@ -253,14 +253,14 @@ namespace SunlightAggregationManager.UserClass
                     if (com_ == "SYSDB")//本机sqlite数据库
                     {
                         DataTable resultTable = MainWindowViewModel.SQLiteHelpers.ExecuteDataSet(da_, null)?.Tables[0] ?? new DataTable();
-                        data_.Add("DB", JsonSerializer.Serialize(resultTable));
+                        data_.Add("DB", Newtonsoft.Json.JsonConvert.SerializeObject(resultTable));
                         data_.Add("Comm", "SYSDB");
                         data_.Add("Enterprise", MainWindowViewModel.Enterprise);
                     }
                     else if (com_ == "DBCDB")//系统dbc数据库
                     {
                         DataTable resultTable = await MainWindowViewModel.dataBase.ExecuteQueryAsync(da_);
-                        data_.Add("DB", JsonSerializer.Serialize(resultTable));
+                        data_.Add("DB", Newtonsoft.Json.JsonConvert.SerializeObject(resultTable));
                         data_.Add("Comm", "DBCDB");
                         data_.Add("Enterprise", MainWindowViewModel.Enterprise);
                     }
diff --git a/ViewModel/MainWindowViewModel.cs b/ViewModel/MainWindowViewModel.cs
index 7ddb4aa..66e1444 100644
--- a/ViewModel/MainWindowViewModel.cs
+++ b/ViewModel/MainWindowViewModel.cs
@@ -324,9 +324,14 @@ namespace SunlightAggregationManager.ViewModel
             {
                 lock (DB)
                 {
-                    DataRow drEmployee = DB.Select(key).First();
-                    object? index = drEmployee.Field<object>(name);
-                    return index;
+                    DataRow[] dataRows = DB.Select(key);
+                    if (dataRows.Count() > 0)
+                    {
+                        DataRow drEmployee = dataRows.First();
+                        object? index = drEmployee.Field<object>(name);
+                        return index;
+                    }
+                    else { return null; }
                 }
             }
             catch (Exception ex)