null check user_id

services/web/app/coffee/Features/StaticPages/UniversityController.coffee

@@ -38,7 +38,7 @@ module.exports = UniversityController =
 
 	getIndexPage: (req, res)->
 		user_id = AuthenticationController.getLoggedInUserId(req)
-		client = sixpack.client(user_id.toString() || req.ip)
+		client = sixpack.client(user_id?.toString() || req.ip)
 		client.participate 'instapage-pages', ['default', 'instapage'], (err, response)->
 			if response?.alternative?.name == "instapage"
 				return res.redirect("/i/university")