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  1. or download this
      my $mode = $cw->cget('-validate');
  if ($mode =~ /match/) {
    $cw->configure(-validate => 'none');
  }
  2. or download this
      my $mode = $cw->cget('-validate');
  if (defined $mode && $mode =~ /match/) {  # <== change
    $cw->configure(-validate => 'none');
  }