threading: deal with improperly-terminated References headers

[public-inbox.git] / lib / PublicInbox / SearchIdx.pm

diff --git a/lib/PublicInbox/SearchIdx.pm b/lib/PublicInbox/SearchIdx.pm
index 0824db03c113a5d001b846b3f4c115ae1a3d7de2..cfb9a0880f622d351ad043dcae1142f5b8a3901a 100644 (file)
--- 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) {