Index: includes/parser/Preprocessor_DOM.php
===================================================================
--- includes/parser/Preprocessor_DOM.php	(revision 60030)
+++ includes/parser/Preprocessor_DOM.php	(working copy)
@@ -1034,7 +1034,7 @@
                     # Insert a heading marker only for <h> children of <root>
                     # This is to stop extractSections from going over multiple tree levels
                     if ( $contextNode->parentNode->nodeName == 'root'
-                      && $this->parser->ot['html'] )
+                      && $this->parser->ot['html'] && $this->title )
                     {
 						# Insert heading index marker
 						$headingIndex = $contextNode->getAttribute( 'i' );