diff --git a/app/views/users.py b/app/views/users.py
index b95c75912c..43d347d7d8 100644
--- a/app/views/users.py
+++ b/app/views/users.py
@@ -530,16 +530,16 @@ def create_user_form(user_name=None, edit=0, all_roles=True):
         else:
             user_name = vals["user_name"]
         # ce login existe ?
-        err = None
-        existing_user = User.query.filter_by(user_name=user_name)
+        err_msg = None
+        existing_user = User.query.filter_by(user_name=user_name).count() > 0
         if (
-            edit and existing_user is None
+            edit and not existing_user
         ):  # safety net, le user_name ne devrait pas changer
-            err = f"identifiant {user_name} inexistant"
-        if not edit and existing_user is not None:
-            err = f"identifiant %{user_name} déjà utilisé"
-        if err:
-            H.append(tf_error_message(f"""Erreur: {err}"""))
+            err_msg = f"identifiant {user_name} inexistant"
+        if not edit and not existing_user:
+            err_msg = f"identifiant {user_name} déjà utilisé"
+        if err_msg:
+            H.append(tf_error_message(f"""Erreur: {err_msg}"""))
             return "\n".join(H) + "\n" + tf[1] + F
 
         if not edit_only_roles:
diff --git a/sco_version.py b/sco_version.py
index fd6f02b186..bc55b7eba7 100644
--- a/sco_version.py
+++ b/sco_version.py
@@ -1,7 +1,7 @@
 # -*- mode: python -*-
 # -*- coding: utf-8 -*-
 
-SCOVERSION = "9.3.28"
+SCOVERSION = "9.3.29"
 
 SCONAME = "ScoDoc"