diff --git a/application/models/Appointments_model.php b/application/models/Appointments_model.php
index 539a6e18..bf8d60fe 100644
--- a/application/models/Appointments_model.php
+++ b/application/models/Appointments_model.php
@@ -545,6 +545,7 @@ class Appointments_Model extends CI_Model {
             ->select('count(*) AS attendants_number')
             ->from('appointments')
             ->group_start()
+            ->group_start()
             ->where('start_datetime <=', $slot_start->format('Y-m-d H:i:s'))
             ->where('end_datetime >', $slot_start->format('Y-m-d H:i:s'))
             ->group_end()
@@ -552,6 +553,7 @@ class Appointments_Model extends CI_Model {
             ->where('start_datetime <', $slot_end->format('Y-m-d H:i:s'))
             ->where('end_datetime >=', $slot_end->format('Y-m-d H:i:s'))
             ->group_end()
+            ->group_end()
             ->where('id_services', $service_id)
             ->get()
             ->row()