--- template.php	2010-08-17 11:11:25.141635001 +0200
+++ template.php	2010-08-17 11:12:06.145635003 +0200
@@ -108,7 +108,10 @@ function zen_ninesixty_preprocess_page(&
 
   // Classes for body element. Allows advanced theming based on context
   // (home page, node of certain type, etc.)
-  $classes = split(' ', $vars['body_classes']);
+  $classes = array();
+  if (isset($vars['body_classes']) && !empty($vars['body_classes'])) {
+    $classes = split(' ', $vars['body_classes']);
+  }
  
 if (theme_get_setting('zen_ninesixty_debug')) {
     $classes[] = 'show-grid'; // Optionally add the wireframes style.