From f2bee586bbc474f553fa3fc5b98449d698051df5 Mon Sep 17 00:00:00 2001
From: Dougal Matthews <dougal@redhat.com>
Date: Wed, 8 Oct 2014 07:58:56 +0100
Subject: [PATCH] Verify that parents isn't empty before popping

If the first iteration of the loop isn't a match then parents will be an
empty list.
---
 mkdocs/toc.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mkdocs/toc.py b/mkdocs/toc.py
index 563cb98d..ffae6570 100644
--- a/mkdocs/toc.py
+++ b/mkdocs/toc.py
@@ -95,7 +95,8 @@ def _parse_html_table_of_contents(html):
             if line.endswith('<ul>'):
                 parents.append(nav)
         elif line.startswith('</ul>'):
-            parents.pop()
+            if parents:
+                parents.pop()
 
     # For the table of contents, always mark the first element as active
     if ret: