--- old.py	2014-10-28 04:47:38.622768887 +0100
+++ cgitb.py	2014-10-28 04:46:47.330766405 +0100
@@ -176,7 +176,7 @@
         value = pydoc.html.repr(getattr(evalue, name))
         exception.append('\n<br>%s%s&nbsp;=\n%s' % (indent, name, value))
 
-    return head + ''.join(frames) + ''.join(exception) + '''
+    result = head + ''.join(frames) + ''.join(exception) + '''
 
 
 <!-- The above is a description of an error in a Python program, formatted
@@ -187,6 +187,7 @@
 -->
 ''' % pydoc.html.escape(
           ''.join(traceback.format_exception(etype, evalue, etb)))
+    return str(result.encode('ascii', 'xmlcharrefreplace'))
 
 def text(einfo, context=5):
     """Return a plain text document describing a given traceback."""