# initialize lookup hash if not already done
if ($self->is_multiplexed && ! defined $self->_row_header ) {
- $self->_row_header({ pairwise { $a->{row_ident} => $b } @{ $self->profile }, @{ $self->header } });
+ $self->_row_header({ pairwise { no warnings 'once'; $a->{row_ident} => $b } @{ $self->profile }, @{ $self->header } });
}
if ($self->is_multiplexed) {