diff --git a/www/class/centreonAuth.LDAP.class.php b/www/class/centreonAuth.LDAP.class.php
index ab908310f0e..aced6bc9b82 100644
--- a/www/class/centreonAuth.LDAP.class.php
+++ b/www/class/centreonAuth.LDAP.class.php
@@ -202,7 +202,6 @@ public function updateUserDn()
 
         if ($this->ldap->rebind()) {
             $userDn = $this->ldap->findUserDn($contactAlias);
-            $userDn = $this->pearDB->escape($userDn);
             if (false === $userDn) {
                 $this->CentreonLog->insertLog(3, "LDAP AUTH - Error : No DN for user " . $contactAlias);
                 return false;
diff --git a/www/install/php/Update-19.04.5.php b/www/install/php/Update-19.04.5.php
index 9c6f16aed3a..691a26ec455 100644
--- a/www/install/php/Update-19.04.5.php
+++ b/www/install/php/Update-19.04.5.php
@@ -48,16 +48,34 @@
     );
 }
 
-// remove ldap users missing contact name
-// these users have been added using the auto-import ldap feature
-// and will be re-imported at their next login.
+// remove LDAP users missing contact name
+// these users have been added using the auto-import LDAP feature and will be re-imported at their next login.
 try {
-    $pearDB->query(
-        "DELETE FROM contact WHERE contact_name is NULL"
+    $pearDB->query('DELETE FROM contact WHERE contact_name = ""');
+} catch (\PDOException $e) {
+    $centreonLog->insertLog(
+        2,
+        "UPGRADE : 19.04.5 Unable to delete LDAP auto-imported users with empty contact_name"
     );
+}
+
+// correct the DN of manually imported users from an LDAP
+try {
+    // finding the data of contacts linked to an LDAP
+    $stmt = $pearDB->query("SELECT contact_id, contact_name, contact_ldap_dn FROM contact WHERE ar_id is NOT NULL");
+    $updateDB = $pearDB->prepare("UPDATE contact SET contact_ldap_dn = :newDn WHERE contact_id = :contactId");
+    while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
+        // removing the double slashes if needed and saving the corrected data
+        if (strpos($row['contact_ldap_dn'], "\\\\")) {
+            $newDn = str_replace("\\\\", "\\", $row['contact_ldap_dn']);
+            $updateDB->bindValue(':newDn', $newDn, \PDO::PARAM_STR);
+            $updateDB->bindValue(':contactId', $row['contact_id'], \PDO::PARAM_INT);
+            $updateDB->execute();
+        }
+    }
 } catch (\PDOException $e) {
     $centreonLog->insertLog(
         2,
-        "UPGRADE : 19.04.5 Unable to delete ldap auto-imported users with empty contact_name"
+        "UPGRADE : 19.04.5 Unable to correct the LDAP DN data"
     );
 }