Overrides PagerPluginBase::exposed_form_validate
function exposed_form_validate(&$form, &$form_state) {
if (!empty($form_state['values']['offset']) && trim($form_state['values']['offset'])) {
if (!is_numeric($form_state['values']['offset']) || $form_state['values']['offset'] < 0) {
form_set_error('offset', t('Offset must be an number greather or equal than 0.'));
}
}
}