my ($arg, $pid) = @_;
my ($imp, $lei) = @$arg;
$lei->child_error($?, 'non-fatal errors during import') if $?;
- my $ign = $lei->{sto}->ipc_do('done'); # PublicInbox::LeiStore::done
+ my $sto = delete $lei->{sto};
+ my $wait = $sto->ipc_do('done') if $sto; # PublicInbox::LeiStore::done
$lei->dclose;
}