diff --git a/api/common/Service/TiposCambios.php b/api/common/Service/TiposCambios.php
index 4628652..26f4b7b 100644
--- a/api/common/Service/TiposCambios.php
+++ b/api/common/Service/TiposCambios.php
@@ -5,6 +5,7 @@ use Carbon\Carbon;
 use GuzzleHttp\Client;
 use GuzzleHttp\Exception\ConnectException;
 use GuzzleHttp\Exception\RequestException;
+use GuzzleHttp\Exception\ServerException;
 use ProVM\Common\Factory\Model as Factory;
 use Contabilidad\Moneda;
 use Contabilidad\TipoCambio;
@@ -35,7 +36,7 @@ class TiposCambios {
             'desde' => $moneda_codigo
         ];
         $headers = [
-            'Authorization' => 'Bearer ' . $this->key
+            'Authorization' => "Bearer {$this->key}"
         ];
         $url = implode('/', [
             $this->base_url,
@@ -44,14 +45,19 @@ class TiposCambios {
         ]);
         try {
             $response = $this->client->request('POST', $url, ['json' => $data, 'headers' => $headers]);
-        } catch (ConnectException | RequestException $e) {
+        } catch (ConnectException | RequestException | ServerException $e) {
             error_log($e);
             return null;
         }
         if ($response->getStatusCode() !== 200) {
+            error_log('Could not connect to python API.');
             return null;
         }
         $result = json_decode($response->getBody());
+        if (isset($result->message) and $result->message === 'Not Authorized') {
+            error_log('Not authorized for connecting to python API.');
+            return null;
+        }
         return $result->serie[0]->valor;
     }
     public function get(string $fecha, int $moneda_id) {
@@ -62,7 +68,7 @@ class TiposCambios {
         }
         // If a value exists in the database
         $cambio = $moneda->cambio($fecha);
-        if ($cambio) {
+        if ($cambio !== null) {
             if ($cambio->desde()->id != $moneda->id) {
                 return 1 / $cambio->valor;
             }
diff --git a/api/src/Moneda.php b/api/src/Moneda.php
index 97602a2..9b0fc81 100644
--- a/api/src/Moneda.php
+++ b/api/src/Moneda.php
@@ -26,7 +26,7 @@ class Moneda extends Model {
         $cambio = $this->factory->find(TipoCambio::class)
             ->where([['desde_id', $this->id], ['hasta_id', 1], ['fecha', $fecha->format('Y-m-d H:i:s')]])
             ->one();
-        if (!$cambio) {
+        if ($cambio === null) {
             $cambio = $this->factory->find(TipoCambio::class)
                 ->where([['hasta_id', $this->id], ['desde_id', 1], ['fecha', $fecha->format('Y-m-d H:i:s')]])
                 ->one();
diff --git a/python/src/app.py b/python/src/app.py
index a372365..4c6bc1b 100644
--- a/python/src/app.py
+++ b/python/src/app.py
@@ -22,7 +22,10 @@ def validate_key(request_obj):
         if isinstance(auth, list):
             auth = auth[0]
         if 'Bearer' in auth:
-            auth = auth.split(' ')[1]
+            try:
+                auth = auth.split(' ')[1]
+            except:
+                return False
         return auth == api_key
     if 'API_KEY' in request_obj.values:
         return request_obj.values.get('API_KEY') == api_key