Invalid argument – template-functions-post.php

Hi all, I can’t seem to resolve a particular error message I’m getting on a Links page I created (see example at http://www.onkels.org/?page_id=18).

The error coming up is:

Warning: Invalid argument supplied for foreach() in
/homepages/18/d91693023/htdocs/onkels/wordpress/wp-includes/template-functions-post.php
on line 378

Line 378-385 reads:

foreach($page_tree[$parent][‘children’] as $page_id) {
$cur_page = $page_tree[$page_id];
$title = $cur_page[‘title’];

$css_class = ‘page_item’;
if( $page_id == $queried_obj->ID) {
$css_class .= ‘ current_page_item’;

}

For reference, this is a custom page template that I created and the error only shows up on that page. I’m running WP 1.5.2 and the Regulus theme.

The code in my sidebar directly before the error is:

<?php

// —————
// add child pages
// —————
if ( is_page() ) {
global $bm_pageID;
$bm_pages = wp_list_pages( ‘sort_column=menu_order&depth=1&title_li=&echo=0&child_of=’ . $bm_pageID );

if ( $bm_pages <> “” ) {
echo “<ul id=\”subpages\”>\n”;
echo ”

• <h2>Sub Pages</h2>

“;
echo $bm_pages;
echo “”;
}
}

Many thanks,
Dave