diff --git a/src/Infrastructure/BotSharp.Core/Plugins/PluginLoader.cs b/src/Infrastructure/BotSharp.Core/Plugins/PluginLoader.cs
index 2601940ef..f9b2efba5 100644
--- a/src/Infrastructure/BotSharp.Core/Plugins/PluginLoader.cs
+++ b/src/Infrastructure/BotSharp.Core/Plugins/PluginLoader.cs
@@ -182,8 +182,11 @@ public PluginDef UpdatePluginStatus(IServiceProvider services, string id, bool e
             foreach (var agentId in plugin.AgentIds)
             {
                 var agent = agentService.LoadAgent(agentId).Result;
-                agent.Disabled = true;
-                agentService.UpdateAgent(agent, AgentField.Disabled);
+                if (agent != null)
+                {
+                    agent.Disabled = true;
+                    agentService.UpdateAgent(agent, AgentField.Disabled);
+                }
             }
         }
         return plugin;
diff --git a/src/Plugins/BotSharp.Plugin.Planner/data/agents/282a7128-69a1-44b0-878c-a9159b88f3b9/instructions/instruction.liquid b/src/Plugins/BotSharp.Plugin.Planner/data/agents/282a7128-69a1-44b0-878c-a9159b88f3b9/instructions/instruction.liquid
index 0cf3094d5..e542c2ee5 100644
--- a/src/Plugins/BotSharp.Plugin.Planner/data/agents/282a7128-69a1-44b0-878c-a9159b88f3b9/instructions/instruction.liquid
+++ b/src/Plugins/BotSharp.Plugin.Planner/data/agents/282a7128-69a1-44b0-878c-a9159b88f3b9/instructions/instruction.liquid
@@ -1,7 +1,7 @@
 Use the TwoStagePlanner approach to plan the overall implementation steps, follow the below steps strictly. 
 1. call plan_primary_stage to generate the primary plan.
 2. If need_additional_information is true, call plan_secondary_stage for the specific primary stage.
-3. You must call plan_summary as the last planning step to summarize the final query.
+3. You must call plan_summary for you final planned output.
 
 *** IMPORTANT ***
 Don't run the planning process repeatedly if you have already got the result of user's request.
diff --git a/src/Plugins/BotSharp.Plugin.Planner/data/agents/282a7128-69a1-44b0-878c-a9159b88f3b9/templates/database.summarize.mysql.liquid b/src/Plugins/BotSharp.Plugin.Planner/data/agents/282a7128-69a1-44b0-878c-a9159b88f3b9/templates/database.summarize.mysql.liquid
index b756d6222..15cd22d30 100644
--- a/src/Plugins/BotSharp.Plugin.Planner/data/agents/282a7128-69a1-44b0-878c-a9159b88f3b9/templates/database.summarize.mysql.liquid
+++ b/src/Plugins/BotSharp.Plugin.Planner/data/agents/282a7128-69a1-44b0-878c-a9159b88f3b9/templates/database.summarize.mysql.liquid
@@ -14,5 +14,7 @@ VALUES ((SELECT MAX(Id) + 1 FROM data_Service), 'HVAC');
 If the table structure didn't mention auto incremental, the data field id needs to insert id manually and you need to use max(id) instead of LAST_INSERT_ID function.
 For example, you should use SET @id = select max(id) from table; 
 
-* the alias of the table name in the sql query should be identical.
+*** the alias of the table name in the sql query should be identical. ***
 *** the generated sql query MUST be basedd on the provided table structure. ***
+*** All queries return a maximum of 20 records. ***
+*** Only select user friendly columns. ***
diff --git a/src/Plugins/BotSharp.Plugin.Planner/data/agents/282a7128-69a1-44b0-878c-a9159b88f3b9/templates/database.summarize.sqlserver.liquid b/src/Plugins/BotSharp.Plugin.Planner/data/agents/282a7128-69a1-44b0-878c-a9159b88f3b9/templates/database.summarize.sqlserver.liquid
index 16c989c4e..d059b4307 100644
--- a/src/Plugins/BotSharp.Plugin.Planner/data/agents/282a7128-69a1-44b0-878c-a9159b88f3b9/templates/database.summarize.sqlserver.liquid
+++ b/src/Plugins/BotSharp.Plugin.Planner/data/agents/282a7128-69a1-44b0-878c-a9159b88f3b9/templates/database.summarize.sqlserver.liquid
@@ -7,6 +7,6 @@ The query must exactly based on the provided table structure. And carefully revi
 Note: Output should be only the sql query with sql comments that can be directly run in SQL Server.
 
 *** the alias of the table name in the sql query should be identical. ***
-*** The generated sql query MUST be basedd on the provided table structure. ***
+*** The generated sql query MUST be based on the provided table structure. ***
 *** All queries return a maximum of 10 records. ***
 *** Only select user friendly columns. ***
diff --git a/src/Plugins/BotSharp.Plugin.SqlDriver/Functions/ExecuteQueryFn.cs b/src/Plugins/BotSharp.Plugin.SqlDriver/Functions/ExecuteQueryFn.cs
index 3dcb1910f..7833bfb4b 100644
--- a/src/Plugins/BotSharp.Plugin.SqlDriver/Functions/ExecuteQueryFn.cs
+++ b/src/Plugins/BotSharp.Plugin.SqlDriver/Functions/ExecuteQueryFn.cs
@@ -36,7 +36,7 @@ public async Task<bool> Execute(RoleDialogModel message)
     private IEnumerable<dynamic> RunQueryInMySql(string[] sqlTexts)
     {
         var settings = _services.GetRequiredService<SqlDriverSetting>();
-        using var connection = new MySqlConnection(settings.MySqlExecutionConnectionString);
+        using var connection = new MySqlConnection(settings.MySqlExecutionConnectionString ?? settings.MySqlConnectionString);
         return connection.Query(string.Join(";\r\n", sqlTexts));
     }