PHP warning in select and radio inputs

  • When i add a select or radio input it show this warning for each option of the input.

    Warning: Undefined array key “id” in?…\wp-content\plugins\wpc-product-options\includes\class-frontend.php?on line?232

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  • They need to change this line with: 

    $label_class = isset($field['id']) ? ('label-price-' . esc_attr( $field['id'])) : '';
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