From de0631f9270560a0a25ef94bdb56e4df4092ad25 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Mon, 30 Nov 2009 12:53:03 -0700
Subject: [PATCH] Fix #4108 (Bug when convertinf an LRF file to MOBI)

---
 Changelog.yaml                    | 3 +++
 src/calibre/ebooks/lrf/objects.py | 5 +++--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/Changelog.yaml b/Changelog.yaml
index 0de35f324c..5ff3b1969d 100644
--- a/Changelog.yaml
+++ b/Changelog.yaml
@@ -55,6 +55,9 @@
     - title: "LIT Input: Remove more invalid markup present in LIT files created by Microsoft Word plugins"
       tickets: [4087]
 
+    - title: "LRF Input: Workaround buggy LRF files with unbalanced closing tags"
+      tickets: [4108]
+
   new recipes:
     - title: The Economist (no subscription required)
       author: Kovid Goyal
diff --git a/src/calibre/ebooks/lrf/objects.py b/src/calibre/ebooks/lrf/objects.py
index ae9736a2f8..93be0f3143 100644
--- a/src/calibre/ebooks/lrf/objects.py
+++ b/src/calibre/ebooks/lrf/objects.py
@@ -872,8 +872,9 @@ class Text(LRFStream):
             if isinstance(c, basestring):
                 s += c
             elif c is None:
-                p = open_containers.pop()
-                s += u'</%s>'%(p.name,)
+                if open_containers:
+                    p = open_containers.pop()
+                    s += u'</%s>'%(p.name,)
             else:
                 s += unicode(c)
                 if not c.self_closing: