/**
 *  Fix for empty ID bug in WPForms
 */

// This can be found around lines 423 - 428.
$labelID = implode( ' ', $field_atts['label_id'] ); // added to a variable
if ( $labelID ) { // checking if the ID is set
  $labelIDoutput = 'id="' . $labelID . '"'; // if so, wrap in attribute, else, don't output anything
}

echo '<label for="wpforms-' . absint( $form_data['id'] ) . '-field_' . absint( $field['id'] ) . '" class="' . implode( ' ', $field_atts['label_class'] ) . '"' . $labelIDoutput .  '>';