users table profix problem with im

im.module - Line 570

Replace:
$results = db_query("SELECT u.uid, u.name FROM {user_relationships} ur INNER JOIN users u on u.uid = ur.requestee_id where rtid = %d AND requester_id = %d", $source_id, $uid);
with
$results = db_query("SELECT u.uid, u.name FROM {user_relationships} ur INNER JOIN {users} u on u.uid = ur.requestee_id where rtid = %d AND requester_id = %d", $source_id, $uid);

to prevent error messages when using tables prefix!