Error in declaration of views_handler::extra_options_validate()

I've been seeing this error:

Strict warning: Declaration of geolocation_proximity_views_handler_field_distance::extra_options_validate() should be compatible with that of views_handler::extra_options_validate() in _registry_check_code() (line 3047 of /Users/-----/Sites/-------/drupal/includes/bootstrap.inc).
Strict warning: Declaration of geolocation_proximity_views_handler_sort_distance::extra_options_validate() should be compatible with that of views_handler::extra_options_validate() in _registry_check_code() (line 3047 of /Users/------/Sites/-------/drupal/includes/bootstrap.inc).

Seems to be this difference:
from views_handlers.inc:

<?php
/**
   * Validate the options form.
   */
  function extra_options_validate($form, &$form_state) { }
?>

from geolocation_proximity_views_handler_field_distance.inc and geolocation_proximity_views_handler_sort_distance.inc

<?php
/**
   * Validate the options form.
   */
  function extra_options_validate(&$form, &$form_state) {
    $this->latlng_validate($form['location'], $form_state['values']['options']['location']);
  }
?>