From f5d52fa4f454db08b6acb661748d1811770a959e Mon Sep 17 00:00:00 2001
From: Georg Brandl <georg@python.org>
Date: Sun, 18 Apr 2010 09:55:38 +0200
Subject: [PATCH] #377: Fix crash in linkcheck builder if all parent nodes have
 no line number set.

---
 CHANGES                      | 2 ++
 sphinx/builders/linkcheck.py | 4 +++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/CHANGES b/CHANGES
index d64a1f712..c9275c720 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,6 +1,8 @@
 Release 0.6.6 (in development)
 ==============================
 
+* #377: Fix crash in linkcheck builder.
+
 * #387: Fix the display of search results in ``dirhtml`` output.
 
 * #376: In autodoc, fix display of parameter defaults containing
diff --git a/sphinx/builders/linkcheck.py b/sphinx/builders/linkcheck.py
index 300a13a10..1fead717a 100644
--- a/sphinx/builders/linkcheck.py
+++ b/sphinx/builders/linkcheck.py
@@ -65,8 +65,10 @@ class CheckExternalLinksBuilder(Builder):
             return
 
         lineno = None
-        while lineno is None and node:
+        while lineno is None:
             node = node.parent
+            if node is None:
+                break
             lineno = node.line
 
         if uri[0:5] == 'http:' or uri[0:6] == 'https:':