diff --git a/web/pgadmin/utils/locker.py b/web/pgadmin/utils/locker.py
index b543da5c5..45666714c 100644
--- a/web/pgadmin/utils/locker.py
+++ b/web/pgadmin/utils/locker.py
@@ -33,7 +33,8 @@ class ConnectionLocker:
             self.lock.acquire()
             current_app.logger.info("Acquired a lock.")
 
-            if session['auth_source_manager']['current_source'] == \
+            if 'auth_source_manager' in session and \
+                session['auth_source_manager']['current_source'] == \
                 KERBEROS and 'KRB5CCNAME' in session \
                     and self.is_kerberos_conn:
                 environ['KRB5CCNAME'] = session['KRB5CCNAME']