AutoBlog Error

Making the "Process" in AutoBlog plug
the Post is published ok but
give me an error o top of the page:

Warning: mysql_real_escape_string() expects parameter 1 to be string, object given in /home/kanjea/public_html /wp-includes/wp-db.php on line 789

Just for you to know Line 789 is:
return mysql_real_escape_string( $string, $this->dbh );

On the function:
function _real_escape( $string ) {
if ( $this->dbh && $this->real_escape )
return mysql_real_escape_string( $string, $this->dbh );
return addslashes( $string );