diff --git a/api/common/Service/TiposCambios.php b/api/common/Service/TiposCambios.php
index 7319c30..4628652 100644
--- a/api/common/Service/TiposCambios.php
+++ b/api/common/Service/TiposCambios.php
@@ -69,6 +69,9 @@ class TiposCambios {
             return $cambio->valor;
         }
         $valor = $this->getValor($fecha, $moneda->codigo);
+        if ($valor === null) {
+            return 1;
+        }
         $data = [
             'fecha' => $fecha->format('Y-m-d H:i:s'),
             'desde_id' => $moneda->id,
diff --git a/api/nginx.conf b/api/nginx.conf
index 069343f..c946d40 100644
--- a/api/nginx.conf
+++ b/api/nginx.conf
@@ -12,11 +12,12 @@ server {
   }
 
   location ~ \.php$ {
+
     if ($request_method = 'OPTIONS') {
-      add_header 'Access-Control-Max-Age' 1728000;
       add_header 'Access-Control-Allow-Origin' '*';
       add_header 'Access-Control-Allow-Headers' 'Authorization,Accept,Origin,DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range';
       add_header 'Access-Control-Allow-Methods' 'GET,POST,OPTIONS,PUT,DELETE,PATCH';
+      add_header 'Access-Control-Max-Age' 1728000;
       add_header 'Content-Type' 'application/json';
       add_header 'Content-Length' 0;
       return 204;
diff --git a/api/src/Cuenta.php b/api/src/Cuenta.php
index 4caa29b..3709a84 100644
--- a/api/src/Cuenta.php
+++ b/api/src/Cuenta.php
@@ -56,6 +56,7 @@ class Cuenta extends Model {
   public function transacciones($limit = null, $start = 0) {
     if ($this->transacciones === null) {
       $transacciones = Model::factory(Transaccion::class)
+        ->select('transacciones.*')
         ->join('cuentas', 'cuentas.id = transacciones.debito_id OR cuentas.id = transacciones.credito_id')
         ->whereEqual('cuentas.id', $this->id)
         ->orderByAsc('transacciones.fecha');