Thank you for your suggestion. Unfortunately it does not solve the problem. I do not quite understand the map you propose as to me it does not seem to apply to the elements of the array I use to sort. Here a dump of the @ResultsFinal (3 records) before and after the sorting. If sorting for $OptOrderToDisplayTable=4, for example, you can see that the corresponding element of $VAR3 still remains undef . This fires an error by unac_string . Am I overseeing something in your code? 

$VAR1 = [
          841,
          'bbb',
          '',
          'bbb',
          'bbb',
          undef,
          undef,
          undef,
          '',
          ''
        ];
$VAR2 = [
          842,
          'bbb',
          '',
          'ccc',
          'aaa',
          undef,
          undef,
          undef,
          '',
          ''
        ];
$VAR3 = [
          850,
          'bbb',
          '',
          'hhh',
          undef,
          undef,
          undef,
          undef,
          '',
          ''
        ];

###After

$VAR1 = [
          841,
          'bbb',
          '',
          'bbb',
          'bbb',
          undef,
          undef,
          undef,
          '',
          ''
        ];
$VAR2 = [
          842,
          'bbb',
          '',
          'ccc',
          'aaa',
          undef,
          undef,
          undef,
          '',
          ''
        ];
$VAR3 = [
          850,
          'bbb',
          '',
          'hhh',
          undef,
          undef,
          undef,
          undef,
          '',
          ''
        ];

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In reply to Re^2: Text::Unaccent::PurePerl undef values by IB2017
in thread Text::Unaccent::PurePerl undef values by IB2017

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