From bb147d741388895899d1b153896ad6a12ef8f987 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Tue, 6 Jun 2017 20:54:47 +0530
Subject: [PATCH] Fix #1696145 [EBook Converter Crashes on CSS
 Parsing](https://bugs.launchpad.net/calibre/+bug/1696145)

---
 src/calibre/ebooks/oeb/stylizer.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/calibre/ebooks/oeb/stylizer.py b/src/calibre/ebooks/oeb/stylizer.py
index bfe6e50ca4..c791b093d0 100644
--- a/src/calibre/ebooks/oeb/stylizer.py
+++ b/src/calibre/ebooks/oeb/stylizer.py
@@ -418,7 +418,10 @@ class Style(object):
         self._style.update(self._stylizer.flatten_style(style))
 
     def _has_parent(self):
-        return (self._element.getparent() is not None)
+        try:
+            return self._element.getparent() is not None
+        except AttributeError:
+            return False  # self._element is None
 
     def _get_parent(self):
         elem = self._element.getparent()
@@ -770,4 +773,3 @@ class Style(object):
     @property
     def is_hidden(self):
         return self._style.get('display') == 'none' or self._style.get('visibility') == 'hidden'
-