diff --git a/app/auth/routes.py b/app/auth/routes.py
index b6a0df9a..5c984828 100644
--- a/app/auth/routes.py
+++ b/app/auth/routes.py
@@ -56,7 +56,9 @@ def login():
 @bp.route("/logout")
 def logout() -> flask.Response:
     "Logout a scodoc user. If CAS session, logout from CAS. Redirect."
-    current_app.logger.info(f"logout user {current_user.user_name}")
+    if current_user:
+        user_name = getattr(current_user, "user_name", "anonymous")
+        current_app.logger.info(f"logout user {user_name}")
     logout_user()
     if ScoDocSiteConfig.is_cas_enabled() and flask.session.get("scodoc_cas_login_date"):
         flask.session.pop("scodoc_cas_login_date", None)
diff --git a/sco_version.py b/sco_version.py
index 17cdecb7..53ca1787 100644
--- a/sco_version.py
+++ b/sco_version.py
@@ -1,7 +1,7 @@
 # -*- mode: python -*-
 # -*- coding: utf-8 -*-
 
-SCOVERSION = "9.4.54"
+SCOVERSION = "9.4.55"
 
 SCONAME = "ScoDoc"