diff --git a/application/controllers/Appointments.php b/application/controllers/Appointments.php
index f1bcd0ad..779d00bf 100755
--- a/application/controllers/Appointments.php
+++ b/application/controllers/Appointments.php
@@ -967,6 +967,14 @@ class Appointments extends CI_Controller {
             $appointment = $post_data['appointment'];
             $customer = $post_data['customer'];
 
+            // Check appointment availability before registering it to the database.
+            $appointment['id_users_provider'] = $this->check_datetime_availability();
+
+            if ( ! $appointment['id_users_provider'])
+            {
+                throw new Exception(lang('requested_hour_is_unavailable'));
+            }
+
             $provider = $this->providers_model->get_row($appointment['id_users_provider']);
             $service = $this->services_model->get_row($appointment['id_services']);
 
@@ -985,12 +993,6 @@ class Appointments extends CI_Controller {
                 return;
             }
 
-            // Check appointment availability before registering it to the database.
-            if ( ! $this->check_datetime_availability())
-            {
-                throw new Exception(lang('requested_hour_is_unavailable'));
-            }
-
             if ($this->customers_model->exists($customer))
             {
                 $customer['id'] = $this->customers_model->find_record_id($customer);