diff --git a/www/protected/models/Candidato.php b/www/protected/models/Candidato.php
index f242788..55b83a0 100644
--- a/www/protected/models/Candidato.php
+++ b/www/protected/models/Candidato.php
@@ -305,8 +305,10 @@ class Candidato extends CActiveRecord
         {
             //PHP dates are displayed as dd/mm/yyyy
             //MYSQL dates are stored as yyyy-mm-dd
+            if ($this->fecha_nacimiento != '') {
             $unafecha = DateTime::createFromFormat('d/m/Y', $this->fecha_nacimiento);
             $this->fecha_nacimiento = $unafecha->format('Y-m-d');
+            }
 
             parent::beforeSave();
             return true;