[Plugin: Gengo] Database error when adding categories

hi all,
i’m running wp 2.3.3 with gengo 2.5-rc4.

i can add new categories, but when doing so i get a database error:

WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘AND language_id = 1’ at line 1]
SELECT synonym, sanitised, description FROM wp_term2syn WHERE term_id = AND language_id = 1

Warning: Cannot modify header information – headers already sent by (output started at /home/domains/xxx/domains/domain.com/public_html/wp-includes/wp-db.php:176) in /home/domains/xxx/domains/domain.com/public_html/wp-includes/classes.php on line 738

the categories are then not displayed correctly.

thanks for your help 🙂