From b715e71fceff9cd8b694414f3bd1c7dc48b9f2bc Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Mon, 26 Dec 2011 23:55:05 +0530
Subject: [PATCH] ...

---
 src/calibre/ebooks/oeb/parse_utils.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/calibre/ebooks/oeb/parse_utils.py b/src/calibre/ebooks/oeb/parse_utils.py
index e02a4d0e61..af0eb479f0 100644
--- a/src/calibre/ebooks/oeb/parse_utils.py
+++ b/src/calibre/ebooks/oeb/parse_utils.py
@@ -85,8 +85,7 @@ def html5_parse(data, max_nesting_depth=500):
     # Check that the asinine HTML 5 algorithm did not result in a tree with
     # insane nesting depths
     for x in data.iterdescendants():
-        if len(x) == 0:
-            # Leaf node
+        if isinstance(x.tag, basestring) and len(x) is 0: # Leaf node
             depth = node_depth(x)
             if depth > max_nesting_depth:
                 raise ValueError('html5lib resulted in a tree with nesting'