diff --git a/invenio_accounts/views/security.py b/invenio_accounts/views/security.py
index 29e11b80..42c604e1 100644
--- a/invenio_accounts/views/security.py
+++ b/invenio_accounts/views/security.py
@@ -27,10 +27,14 @@ def security():
         if SessionActivity.is_current(session.sid_s):
             master_session = session
             del sessions[index]
+
+    # If the master session is still `None`, filter it out
+    sessions = [master_session] + sessions if master_session is not None else sessions
+
     return render_template(
         current_app.config["ACCOUNTS_SETTINGS_SECURITY_TEMPLATE"],
         formclass=RevokeForm,
-        sessions=[master_session] + sessions,
+        sessions=sessions,
         is_current=SessionActivity.is_current,
     )