--- og_forum.module	2009-10-15 00:49:56.000000000 +1100
+++ og_forum_working.module	2009-10-23 16:13:11.000000000 +1100
@@ -1317,7 +1317,7 @@ function og_forum_get_vid() {
 }	
 
 function og_forum_preprocess_node(&$variables) {
-  if ($variables['type'] == 'forum') {
+  if (!empty($variables['page']) && $variables['type'] == 'forum') {
     _og_forum_set_breadcrumb($variables['tid'], TRUE); 
   }
 }