From e9eaee4969767cdb1359700ca6c4c0df7eed8a07 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Tue, 28 Jul 2009 14:12:52 -0600
Subject: [PATCH] Handle badly malformed font sizes in CSS

---
 src/calibre/ebooks/oeb/stylizer.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/calibre/ebooks/oeb/stylizer.py b/src/calibre/ebooks/oeb/stylizer.py
index 18c16e44d5..9a52709ca4 100644
--- a/src/calibre/ebooks/oeb/stylizer.py
+++ b/src/calibre/ebooks/oeb/stylizer.py
@@ -411,6 +411,8 @@ class Style(object):
                     result = size
             else:
                 result = self._unit_convert(value, base=base, font=base)
+                if not isinstance(result, (int, float, long)):
+                    return base
                 if result < 0:
                     result = normalize_fontsize("smaller", base)
             if factor: