Index: taxonomy.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/taxonomy/taxonomy.module,v
retrieving revision 1.414
diff -u -p -r1.414 taxonomy.module
--- taxonomy.module	27 Jan 2008 17:55:15 -0000	1.414
+++ taxonomy.module	23 Feb 2008 21:30:00 -0000
@@ -1180,12 +1191,15 @@ function taxonomy_nodeapi($node, $op, $a
  * Implementation of hook_nodeapi('update_index').
  */
 function taxonomy_node_update_index(&$node) {
-  $output = array();
-  foreach ($node->taxonomy as $term) {
-    $output[] = $term->name;
-  }
-  if (count($output)) {
-    return '<strong>('. implode(', ', $output) .')</strong>';
+  if (is_object($node) && property_exists($node, 'taxonomy') && 
+      is_array($node->taxonomy)) {
+    $output = array();
+    foreach ($node->taxonomy as $term) {
+      $output[] = $term->name;
+    }
+    if (count($output)) {
+      return '<strong>('. implode(', ', $output) .')</strong>';
+    }
   }
 }