ExceptionSQL rencontrée : Erreur SQL !

Requête = SELECT * FROM repertoires_langues WHERE id_langue =

Erreur retournée : 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 '' at line 1
Code d'exception 201 : erreur SQL de type SELECT.

Localisation de l'erreur :
#0 /var/www/vhosts/hotelaltina.com/httpdocs/inc.liens.php(7): SQL->query('SELECT * FROM r...')
#1 /var/www/vhosts/hotelaltina.com/httpdocs/entete.php(5): require_once('/var/www/vhosts...')
#2 /var/www/vhosts/hotelaltina.com/httpdocs/affiche_article.php(31): require_once('/var/www/vhosts...')
#3 {main}