@@ -130,7 +130,8 @@ class MapSetting(Setting):
130130 self.key = data
131131
132132 def save(self, name, resp):
133− resp.set_cookie(name, bytes(self.key), max_age=COOKIE_MAX_AGE)
133+ if hasattr(self, 'key'):
134+ resp.set_cookie(name, bytes(self.key), max_age=COOKIE_MAX_AGE)
134135
135136
136137class SwitchableSetting(Setting):