diff --git a/htdocs/core/db/mysqli.class.php b/htdocs/core/db/mysqli.class.php
index 9c023a05478..719e34c5df9 100644
--- a/htdocs/core/db/mysqli.class.php
+++ b/htdocs/core/db/mysqli.class.php
@@ -448,8 +448,9 @@ class DoliDBMysqli extends DoliDB
             1215 => 'DB_ERROR_CANNOT_ADD_FOREIGN_KEY_CONSTRAINT',
             1216 => 'DB_ERROR_NO_PARENT',
             1217 => 'DB_ERROR_CHILD_EXISTS',
-            1396 => 'DB_ERROR_USER_ALREADY_EXISTS', // When creating user already existing
-            1451 => 'DB_ERROR_CHILD_EXISTS'
+            1396 => 'DB_ERROR_USER_ALREADY_EXISTS', // When creating a user that already existing
+            1451 => 'DB_ERROR_CHILD_EXISTS',
+            1826 => 'DB_ERROR_KEY_NAME_ALREADY_EXISTS'
             );
 
             if (isset($errorcode_map[$this->db->errno])) {