diff -up diff_original/diff.module diff/diff.module
--- diff_original/diff.module	2008-05-22 21:07:11.000000000 +0200
+++ diff/diff.module	2010-07-29 20:39:21.000000000 +0200
@@ -365,7 +365,7 @@ function _diff_body_rows(&$old_node, &$n
   foreach ($node_diffs as $node_diff) {
     $diff = new Diff($node_diff['#old'], $node_diff['#new']);
     $formatter = new DrupalDiffFormatter();
-    if (isset($node_diff['#format'])) {
+    if (isset($node_diff['#format']['show_header'])) {
       $formatter->show_header = $node_diff['#format']['show_header'];
     }
     $diff_rows = $formatter->format($diff);
Common subdirectories: diff_original/translations and diff/translations