Index: contributions/modules/advanced_forum/advanced_forum.module
--- contributions/modules/advanced_forum/advanced_forum.module Base (1.149.2.85.2.3)
+++ contributions/modules/advanced_forum/advanced_forum.module Locally Modified (Based On 1.149.2.85.2.3)
@@ -1122,7 +1122,15 @@
 function advanced_forum_type_is_in_forum($node, $tid=0) {
   $vid = (empty($vid)) ? variable_get('forum_nav_vocabulary', 0) : $vid;
   if (isset($node->taxonomy_forums)) {
-    foreach ($node->taxonomy_forums[$node->language] as $tforum) {
+    // Check for language used
+    if (!isset($node->taxonomy_forums[$node->language])) {
+      $langcode = LANGUAGE_NONE;
+    }
+    else {
+      $langcode = $node->language;
+    }
+
+    foreach ($node->taxonomy_forums[$langcode] as $tforum) {
 			if (!isset($tforum['taxonomy_term'])) {
 				continue;
 			}
Index: contributions/modules/advanced_forum/includes/advanced_forum_preprocess_node.inc
--- contributions/modules/advanced_forum/includes/advanced_forum_preprocess_node.inc Base (1.1.2.31.2.1)
+++ contributions/modules/advanced_forum/includes/advanced_forum_preprocess_node.inc Locally Modified (Based On 1.1.2.31.2.1)
@@ -43,8 +43,16 @@
       'comment_count' => $variables['comment_count']
       ));

+    // Check for language used
+    if (!isset($node->taxonomy_forums[$node->language])) {
+      $langcode = LANGUAGE_NONE;
+    }
+    else {
+      $langcode = $node->language;
+    }
+
     // Is this really needed?
-    $term = $node->taxonomy_forums[$node->language][0]['taxonomy_term'];
\ No newline at end of file
+    $term = $node->taxonomy_forums[$langcode][0]['taxonomy_term'];
     $variables['terms'] = l($term->name, $term->uri['path']);
   }

Index: contributions/modules/advanced_forum/includes/style.inc
--- contributions/modules/advanced_forum/includes/style.inc Base (1.1.2.16.2.1)
+++ contributions/modules/advanced_forum/includes/style.inc Locally Modified (Based On 1.1.2.16.2.1)
@@ -305,16 +305,25 @@

 function advanced_forum_is_forum_tagged($node, $preview = FALSE) {
   $vid = variable_get('forum_nav_vocabulary', '');
+
+  // Check for language used
+  if (!isset($node->taxonomy_forums[$node->language])) {
+    $langcode = LANGUAGE_NONE;
+  }
+  else {
+    $langcode = $node->language;
+  }
+
   if ($preview) {
-     foreach ($node->taxonomy_forums[$node->language] as $tf) {
-      if ($tf->taxonomy_term->vid == $vid) {
+    foreach ($node->taxonomy_forums[$langcode] as $tforum) {
+      if ($tforum->taxonomy_term->vid == $vid) {
         return TRUE;
       }
     }
   }
   else {
     // Get a list of the terms attached to this node
-    $terms = $node->taxonomy_forums[$node->language];
+    $terms = $node->taxonomy_forums[$langcode];
     if (count($terms) > 0) {
       return TRUE;
     }
@@ -404,8 +413,16 @@
   // See if this is a forum post:
   $vid = variable_get('forum_nav_vocabulary', '');

-  foreach ($node->taxonomy_forums[$node->language] as $tf) {
-    if ($tf->taxonomy_term->vid == $vid) {
+  // Check for language used
+  if (!isset($node->taxonomy_forums[$node->language])) {
+    $langcode = LANGUAGE_NONE;
+  }
+  else {
+    $langcode = $node->language;
+  }
+
+  foreach ($node->taxonomy_forums[$langcode] as $tforum) {
+    if ($tforum->taxonomy_term->vid == $vid) {
       return _advanced_forum_comment_wrapper($content, $node);
     }
   }