Index: user/externallib.php
===================================================================
RCS file: /cvsroot/moodle/moodle/user/externallib.php,v
retrieving revision 1.21
diff -u -r1.21 externallib.php
--- user/externallib.php	14 Apr 2010 09:45:49 -0000	1.21
+++ user/externallib.php	30 Apr 2010 10:52:52 -0000
@@ -340,7 +340,7 @@
 
                 $userarray = (array) $user; //we want to return an array not an object
                 /// now we transfert all profile_field_xxx into the customfields external_multiple_structure required by description
-                $userarray['customfields'] = null;
+		$userarray['customfields'] = array();
                 $customfields = profile_user_record($user->id);
                 $customfields = (array) $customfields;
                 foreach ($customfields as $key => $value) {