view: avoid broken parent link in per-message view

Broken by commit f24d362fb0959cdfab37a6da0a66a985764a2752
("view: display thread outline in single-message view")

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/PublicInbox/View.pm b/lib/PublicInbox/View.pm
index 3ee67902..584a2d70 100644
--- a/lib/PublicInbox/View.pm
+++ b/lib/PublicInbox/View.pm
@@ -468,6 +468,7 @@ sub html_footer {
         my $idx = $standalone ? " <a\nhref=\"../../\">index</a>" : '';
         if ($idx && $srch) {
                 my $next = thread_inline(\$idx, $ctx, $mime);
+                $irt = $mime->header('In-Reply-To');
                 if (defined $irt) {
                         $irt = PublicInbox::Hval->new_msgid($irt);
                         $irt = $irt->as_href;