diff --git a/lib/pygazelle/api.py b/lib/pygazelle/api.py
index a778b93a..885b27d8 100644
--- a/lib/pygazelle/api.py
+++ b/lib/pygazelle/api.py
@@ -155,6 +155,11 @@ class GazelleAPI(object):
             params['auth'] = self.authkey
         params.update(kwargs)
         r = self.session.get(url, params=params, allow_redirects=False, timeout=self.default_timeout)
+
+        if r.status_code == 302 and r.raw.headers['location'] == 'login.php':
+            self.logged_in_user = None
+            raise LoginException("User login expired")
+
         self.past_request_timestamps.append(time.time())
         return r.content