diff --git a/la_facebook/callbacks/base.py b/la_facebook/callbacks/base.py
index 9494541..349f4fd 100644
--- a/la_facebook/callbacks/base.py
+++ b/la_facebook/callbacks/base.py
@@ -71,7 +71,8 @@ def redirect_url(self, request, fallback_url=settings.LOGIN_REDIRECT_URL,
             logger.debug("redirect not in get params")
             # try the session if available
             if hasattr(request, "session"):
-                redirect_to = request.session.get(session_key_value)
+                redirect_to = request.session.get(session_key_value, "")
+                if redirect_to is None: redirect_to = ""
                 # Heavier security check -- don't allow redirection to a different host.
                 netloc = urlparse.urlparse(redirect_to)[1]
                 if netloc and netloc != request.host: