diff --git a/Documentation/git.txt b/Documentation/git.txt
index 710d750cfd..d08a8bb4f2 100644
--- a/Documentation/git.txt
+++ b/Documentation/git.txt
@@ -44,9 +44,10 @@ unreleased) version of git, that is available from 'master'
 branch of the `git.git` repository.
 Documentation for older releases are available here:
 
-* link:v1.7.6/git.html[documentation for release 1.7.6]
+* link:v1.7.6.1/git.html[documentation for release 1.7.6.1]
 
 * release notes for
+  link:RelNotes/1.7.6.1.txt[1.7.6.1].
   link:RelNotes/1.7.6.txt[1.7.6].
 
 * link:v1.7.5.4/git.html[documentation for release 1.7.5.4]
diff --git a/upload-pack.c b/upload-pack.c
index 6420918abe..8739bfacdf 100644
--- a/upload-pack.c
+++ b/upload-pack.c
@@ -533,6 +533,8 @@ static void check_non_tip(void)
 	namebuf[41] = '\n';
 	for (i = get_max_object_index(); 0 < i; ) {
 		o = get_indexed_object(--i);
+		if (!o)
+			continue;
 		if (!(o->flags & OUR_REF))
 			continue;
 		memcpy(namebuf + 1, sha1_to_hex(o->sha1), 40);