try catch in a point in user.js that is maybe causing this stacktrace

[2014-09-26 15:10:42.997] [ERROR] [default] - [UncaughtException] [TypeError: Cannot set property 'user_id' of undefined]
TypeError: Cannot set property 'user_id' of undefined
    at module.exports.routes./ws/1.1/user.get (/var/sites/api-proxy-node-js/routes/user.js:121:49)
    at _fulfilled (/var/sites/api-proxy-node-js/node_modules/q/q.js:798:54)
    at Promise.then.self.promiseDispatch.done (/var/sites/api-proxy-node-js/node_modules/q/q.js:827:30)
    at Promise.promise.promiseDispatch (/var/sites/api-proxy-node-js/node_modules/q/q.js:760:13)