An error has occured

Invalid SQL query.

File: /usr/home/ec/public_html/regions/contact.php
Line: 20
Function: query("SELECT organisations.org_id, organisations.org_name, front_users.*, front_users.description AS user_desc, contact_types.name AS contact_type, contact_types.description, towns.name AS town_name, site_regions.region_name, site_regions.region_id FROM front_users INNER JOIN organisations ON (front_users.org_id=organisations.org_id) LEFT JOIN contact_types ON (front_users.ct_id=contact_types.ct_id) LEFT JOIN towns ON (front_users.town_id=towns.town_id) LEFT JOIN site_regions ON (towns.region_id=site_regions.region_id) WHERE front_users.fuser_id= AND front_users.deleted=0")
Data 1: SELECT organisations.org_id, organisations.org_name, front_users.*, front_users.description AS user_desc, contact_types.name AS contact_type, contact_types.description, towns.name AS town_name, site_regions.region_name, site_regions.region_id FROM front_users INNER JOIN organisations ON (front_users.org_id=organisations.org_id) LEFT JOIN contact_types ON (front_users.ct_id=contact_types.ct_id) LEFT JOIN towns ON (front_users.town_id=towns.town_id) LEFT JOIN site_regions ON (towns.region_id=site_regions.region_id) WHERE front_users.fuser_id= AND front_users.deleted=0
Data 2: Error Number: 1064
Data 3: 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 front_users.deleted=0' at line 15