Impossible d'effectuer la requête

Voici la requête :
SELECT cat_name FROM an_categ WHERE tb_id='101' and cat_id=

Voici le message d'erreur renvoyé par la base de données :
1064 : 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

Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /home/maisondh/www/en/annuaire.php on line 52
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