diff --git a/app/auth/cas.py b/app/auth/cas.py
index 4aac61b1..b9584f83 100644
--- a/app/auth/cas.py
+++ b/app/auth/cas.py
@@ -30,7 +30,7 @@ def after_cas_login():
             flask.session.get("CAS_USERNAME"),
         )
         if cas_id is not None:
-            user: User = User.query.filter_by(cas_id=cas_id).first()
+            user: User = User.query.filter_by(cas_id=str(cas_id)).first()
             if user and user.active:
                 if user.cas_allow_login:
                     current_app.logger.info(f"CAS: login {user.user_name}")
diff --git a/app/scodoc/sco_users.py b/app/scodoc/sco_users.py
index 7a4f21d5..72168b83 100644
--- a/app/scodoc/sco_users.py
+++ b/app/scodoc/sco_users.py
@@ -351,7 +351,7 @@ def check_modif_user(
 
     # Unicité du cas_id
     if cas_id:
-        cas_users = User.query.filter_by(cas_id=cas_id).all()
+        cas_users = User.query.filter_by(cas_id=str(cas_id)).all()
         if edit:
             if cas_users and (
                 len(cas_users) > 1 or cas_users[0].user_name != user_name