diff --git a/Transbank/Common/RequestService.cs b/Transbank/Common/RequestService.cs
index 91966d7..107a28a 100644
--- a/Transbank/Common/RequestService.cs
+++ b/Transbank/Common/RequestService.cs
@@ -38,7 +38,7 @@ public static string Perform<T>(BaseRequest request, Options options) where T :
                 {
                     var jsonObject = (JObject)JsonConvert.DeserializeObject(jsonResponse);
                     throw (T)Activator.CreateInstance(typeof(T), new object[] {
-                        (int)response.StatusCode, $"Error message: {jsonObject.Value<string>("error_message")}"
+                        (int)response.StatusCode, $"Error message: {jsonObject?.Value<string>("error_message")}"
                     });
                 }
                 return jsonResponse;