I installed a MySql.Data NuGet Package to my project
and tried to create table using ExecuteNonQuery.

using (MySqlConnection con = new MySqlConnection(connectionString))
                {
                    con.Open();
                    MySqlCommand sqlCommand = new MySqlCommand();
                    sqlCommand.Connection = con;
                    string cmd = @"CREATE TABLE [TABLENAME] (
                                TIMESTAMP VARCHAR(30) NOT NULL,
                                TAGNAME NVARCHAR(250) NOT NULL,
                                MESSAGE NVARCHAR(1000) NOT NULL,
                                LIMITTYPE NVARCHAR(100) NOT NULL,
                                CLASSNAME NVARCHAR(100) NOT NULL,
                                STATE NVARCHAR(20) NOT NULL,
                                PRIMARY KEY (TIMESTAMP, TAGNAME),
                                KEY IDX_[TABLENAME] (TIMESTAMP, TAGNAME)
                                ) ENGINE=InnoDB DEFAULT CHARSET=utf8";
                    sqlCommand.CommandText = cmd.Replace("[TABLENAME]", tableName);
                    sqlCommand.ExecuteNonQuery();
                }

You can see the code above.
However, when I execute that command, it throws NullReferenceException from sqlCommand.ExecuteNonQuery();.
And, I go to my MySql workbench and can find the table is created and have a row with all null values which is not permitted.
Like this,
enter image description here

Why is this happening, and how can I stop it?

I executed the query from workbench itself and there is no row inserted.
I want to create a table only without insert a row.