diff --git a/Src/Asp.Net/SqlSugar/Realization/MySql/MySqlProvider.cs b/Src/Asp.Net/SqlSugar/Realization/MySql/MySqlProvider.cs
index da41e6930..024a787b6 100644
--- a/Src/Asp.Net/SqlSugar/Realization/MySql/MySqlProvider.cs
+++ b/Src/Asp.Net/SqlSugar/Realization/MySql/MySqlProvider.cs
@@ -20,6 +20,7 @@ namespace SqlSugar
                     try
                     {
                         var mySqlConnectionString = base.Context.CurrentConnectionConfig.ConnectionString;
+                        Check.ExceptionEasy(mySqlConnectionString == null, "ConnectionString is not null", "连接字符串ConnectionString不能为Null");
                         if (!mySqlConnectionString.ToLower().Contains("charset")&& !mySqlConnectionString.ToLower().Contains("character"))
                         {
                             mySqlConnectionString = mySqlConnectionString.Trim().TrimEnd(';') + ";charset=utf8;";