lib/PublicInbox/Import.pm | 1 +

diff --git a/lib/PublicInbox/Import.pm b/lib/PublicInbox/Import.pm
index 4e3b4c55179766797b41960ea7c55bc266f210f4..bfa7a8053297a50c44c5e1f4fe173fbd7f882bbf 100644
--- a/lib/PublicInbox/Import.pm
+++ b/lib/PublicInbox/Import.pm
@@ -451,6 +451,7 @@
 sub atfork_child {
 	my ($self) = @_;
 	foreach my $f (qw(in out)) {
+		next unless defined($self->{$f});
 		close $self->{$f} or die "failed to close import[$f]: $!\n";
 	}
 }