Database-Error bei den Sidebar-Links[$link_cats]

WordPress database error: [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]
SELECT cat_id, cat_name FROM

<div class="sidehead">Links</div>
<?php $link_cats = $wpdb->get_results("SELECT cat_id, cat_name FROM $wpdb->linkcategories"); foreach ($link_cats as $link_cat) { ?>    
  
        <div class="sidetext" id="linkcat<?php echo $link_cat->cat_id; ?>"><?php echo $link_cat->cat_name; ?>
        <ul><?php wp_get_links($link_cat->cat_id); ?></ul></div>


        <?php } ?>
<?php } ?>

mysql -V
mysql  Ver 12.22 Distrib 4.0.24, for pc-linux-gnu (i386)