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-rw-r--r--lib/PublicInbox/Smsg.pm2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/PublicInbox/Smsg.pm b/lib/PublicInbox/Smsg.pm
index b4cc2ecb..da8ce590 100644
--- a/lib/PublicInbox/Smsg.pm
+++ b/lib/PublicInbox/Smsg.pm
@@ -76,7 +76,7 @@ sub parse_references ($$$) {
         return $refs if scalar(@$refs) == 0;
 
         # prevent circular references here:
-        my %seen = ( $smsg->{mid} => 1 );
+        my %seen = ( ($smsg->{mid} // '') => 1 );
         my @keep;
         foreach my $ref (@$refs) {
                 if (length($ref) > PublicInbox::MID::MAX_MID_SIZE) {