--- ps-pdf.cxx	2006-08-01 18:58:50.000000000 +0200
+++ ps-pdf.cxx	2008-04-26 21:19:49.000000000 +0200
@@ -3624,7 +3624,7 @@
   * Get the width of the page number, leave room for three dots...
   */
 
-  if (heading >= 0)
+  if (heading >= 0 && heading < num_headings)
   {
     hpage       = heading_pages[heading];
     numberwidth = get_width((uchar *)pages[hpage].page_text,