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-rw-r--r--lib/PublicInbox/IMAP.pm1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/PublicInbox/IMAP.pm b/lib/PublicInbox/IMAP.pm
index d8c898f4..8ab4b1e7 100644
--- a/lib/PublicInbox/IMAP.pm
+++ b/lib/PublicInbox/IMAP.pm
@@ -246,6 +246,7 @@ sub uo2m_extend ($$;$) {
         my $base = $self->{uid_base};
         ++$beg;
         my $uids = $self->{ibx}->over->uid_range($beg, $base + UID_SLICE);
+        return $uo2m if !scalar(@$uids);
         my @tmp; # [$UID_OFFSET] => $MSN
         my $write_method = $_[2] // 'msg_more';
         if (ref($uo2m)) {