Warning: mysql_real_escape_string() expects parameter 1 to be string

After upgrade I get this error:

Warning: mysql_real_escape_string() expects parameter 1 to be string, array given in /var/www/diskidee/wp-includes/wp-db.php on line 1129

(still using php 5.2)

https://ww.wp.xz.cn/plugins/avh-first-defense-against-spam/