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-rw-r--r--lib/PublicInbox/InboxWritable.pm2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/PublicInbox/InboxWritable.pm b/lib/PublicInbox/InboxWritable.pm
index 3558403b..c54be046 100644
--- a/lib/PublicInbox/InboxWritable.pm
+++ b/lib/PublicInbox/InboxWritable.pm
@@ -57,7 +57,7 @@ sub importer {
                 die "v2 not supported: $@\n" if $@;
                 my $opt = $self->{-creat_opt};
                 my $v2w = PublicInbox::V2Writable->new($self, $opt);
-                $v2w->{parallel} = $parallel;
+                $v2w->{parallel} = $parallel if defined $parallel;
                 $v2w;
         } elsif ($v == 1) {
                 my @arg = (undef, undef, undef, $self);