Index: menu.php
===================================================================
--- menu.php	(revision 11921)
+++ menu.php	(working copy)
@@ -36,7 +36,7 @@
 
 	$i = 15;
 	foreach ( $wp_taxonomies as $tax ) {
-		if ( $tax->hierarchical || ! in_array('post', (array) $tax->object_type, true) )
+		if ( $tax->hierarchical || ! in_array('post', (array) $tax->object_type, true) || ! $tax->label )
 			continue;
 
 		$submenu['edit.php'][$i] = array( esc_attr($tax->label), 'manage_categories', 'edit-tags.php?taxonomy=' . $tax->name );