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-rw-r--r--lib/PublicInbox/SearchIdx.pm5
1 files changed, 2 insertions, 3 deletions
diff --git a/lib/PublicInbox/SearchIdx.pm b/lib/PublicInbox/SearchIdx.pm
index 0824db03..cfb9a088 100644
--- a/lib/PublicInbox/SearchIdx.pm
+++ b/lib/PublicInbox/SearchIdx.pm
@@ -414,9 +414,8 @@ sub link_message {
 
         # last References should be IRT, but some mail clients do things
         # out of order, so trust IRT over References iff IRT exists
-        my @refs = ($hdr->header_raw('References'),
-                        $hdr->header_raw('In-Reply-To'));
-        @refs = ((join(' ', @refs)) =~ /<([^>]+)>/g);
+        my @refs = (($hdr->header_raw('References') || '') =~ /<([^>]+)>/g);
+        push(@refs, (($hdr->header_raw('In-Reply-To') || '') =~ /<([^>]+)>/g));
 
         my $tid;
         if (@refs) {