diff --git a/main/cron/import_csv.php b/main/cron/import_csv.php
index 7208fbffb6..06ad824edf 100755
--- a/main/cron/import_csv.php
+++ b/main/cron/import_csv.php
@@ -5,9 +5,7 @@ use Chamilo\CourseBundle\Entity\CCalendarEvent;
 use Chamilo\CourseBundle\Entity\CItemProperty;
 use Chamilo\PluginBundle\Entity\StudentFollowUp\CarePost;
 use Fhaculty\Graph\Graph;
-use Graphp\GraphViz\GraphViz;
 use Monolog\Handler\BufferHandler;
-use Monolog\Handler\NativeMailerHandler;
 use Monolog\Handler\RotatingFileHandler;
 use Monolog\Handler\StreamHandler;
 use Monolog\Logger;
@@ -826,6 +824,35 @@ class ImportCsv
                     $userInfoByOfficialCode = api_get_user_info_from_official_code($row['official_code']);
                 }
 
+                $userInfoFromUsername = api_get_user_info_from_official_code($row['username']);
+                if (!empty($userInfoFromUsername)) {
+                    $extraFieldValue = new ExtraFieldValue('user');
+                    $extraFieldValues = $extraFieldValue->get_values_by_handler_and_field_variable(
+                        $userInfoFromUsername['user_id'],
+                        $this->extraFieldIdNameList['user']
+                    );
+
+                    if (!empty($extraFieldValues)) {
+                        $value = 0;
+                        foreach ($extraFieldValues as $extraFieldValue) {
+                            $value = $extraFieldValue['value'];
+                        }
+                        if (!empty($user_id) && $value != $user_id) {
+                            $emails = api_get_configuration_value('cron_notification_help_desk');
+                            if (!empty($emails)) {
+                                $subject = 'User not added due to same username';
+                                $body = 'Cannot add username: "'.$row['username'].'" 
+                                    with external_user_id: '.$row['extra_'.$this->extraFieldIdNameList['user']].'
+                                    because '.$userInfoFromUsername['username'].' with external_user_id '.$value.' exists on the portal    
+    ';
+                                foreach ($emails as $email) {
+                                    api_mail_html('', $email, $subject, $body);
+                                }
+                            }
+                        }
+                    }
+                }
+
                 if (empty($userInfo) && empty($userInfoByOfficialCode)) {
                     // Create user
                     $result = UserManager::create_user(
@@ -840,7 +867,7 @@ class ImportCsv
                         $row['phone'],
                         null, //$row['picture'], //picture
                         $row['auth_source'], // ?
-                        $expirationDateOnCreate, //'0000-00-00 00:00:00', //$row['expiration_date'], //$expiration_date = '0000-00-00 00:00:00',
+                        $expirationDateOnCreate,
                         1, //active
                         0,
                         null, // extra
@@ -973,7 +1000,6 @@ class ImportCsv
                                 );
                             }
                         }
-
                         $this->logger->addInfo("Students - User updated: ".$row['username']);
                     } else {
                         $this->logger->addError("Students - User NOT updated: ".$row['username']." ".$row['firstname']." ".$row['lastname']);
diff --git a/main/install/configuration.dist.php b/main/install/configuration.dist.php
index 3e45686c4d..0d1dc212fb 100755
--- a/main/install/configuration.dist.php
+++ b/main/install/configuration.dist.php
@@ -227,6 +227,9 @@ $_configuration['system_stable'] = NEW_VERSION_STABLE;
 // E-mail accounts to send notifications to when executing cronjobs - works for main/cron/import_csv.php
 //$_configuration['cron_notification_mails'] = array('email@example.com', 'email2@example.com');
 
+// Help desk emails that will recieve email notifications in import_csv.php
+//$_configuration['cron_notification_help_desk'] = array('email@example.com', 'email2@example.com');
+
 // Only shows the fields in this list
 /*$_configuration['allow_fields_inscription'] = [
     'fields' => [