Index: buildmodes.module
===================================================================
--- buildmodes.module	(revision 32499)
+++ buildmodes.module	(working copy)
@@ -222,10 +222,10 @@
  */
 function buildmodes_preprocess_content_field(&$vars) {
   $modes = buildmodes_list_modes(TRUE);
-  $node = $vars['node'];
+  $node = isset($vars['node']) ? $vars['node'] : NULL;
   $element = $vars['element'];
 
-  if (in_array($node->build_mode, array_keys($modes), TRUE)) {
+  if ($node && in_array($node->build_mode, array_keys($modes), TRUE)) {
 
     $mode = $node->build_mode;