php warning and SQL syntax error [1.3.5]

[helmetman]

Whenever I try to view the products by manufacturers ("index.php?main_page=index&manufacturers_id=X") I get the following:

Warning: constant() [function.constant]: Couldn't find constant in <MY_STORE>/includes/init_includes/init_add_crumbs.php on line 45
1064 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 'from where manufacturers_id = 1' at line 2
in:
[select from where manufacturers_id = 1]

Lines 35 through 48 of that file:

/**
 * split to add manufacturers_name to the display
 */
if (isset($_GET['manufacturers_id'])) {
  $manufacturers_query = "select manufacturers_name
                            from " . TABLE_MANUFACTURERS . "
                            where manufacturers_id = '" . (int)$_GET['manufacturers_id'] . "'";

  $manufacturers = $db->Execute($manufacturers_query);

  if ($manufacturers->RecordCount() > 0) {
    $breadcrumb->add($manufacturers->fields['manufacturers_name'], zen_href_link(FILENAME_DEFAULT, 'manufacturers_id=' . $_GET['manufacturers_id']));
  }
} 

Heres is some info about my server and stuff.

Database: MySQL 5.0.18-standard-log

HTTP Server: Apache/2.0.54 (Unix) PHP/4.4.2 mod_ssl/2.0.54 OpenSSL/0.9.7e mod_fastcgi/2.4.2 DAV/2 SVN/1.1.4

PHP Version: 5.1.2 (Zend: 2.1.0)

Zen Cart 1.3.5
Database Patch Level: 1.3.5

Ask if you need more. I really want to fix this problem.