UMovie crashes on undefined id

[wfortin]

» 23 Nov 2015 15:09:10.290 2015-11-23 20:09:09.968338+00:00 app web.1 - - TypeError: Cannot read property 'id' of null at Query. (/app/routes/user.js:85:55) at /app/node_modules/mongoose/node_modules/kareem/index.js:177:19 at /app/node_modules/mongoose/node_modules/kareem/index.js:109:16 at doNTCallback0 (node.js:417:9) at process._tickCallback (node.js:346:13) Exception
» 23 Nov 2015 15:09:10.317 2015-11-23 20:09:09.982268+00:00 heroku router - - at=error code=H13 desc="Connection closed without response" method=POST path="/follow" host=umovie.herokuapp.com request_id=b8509f2c-1841-480c-9f7c-6664bd0855d4 fwd="173.178.180.86" dyno=web.1 connect=1ms service=130ms status=503 bytes=0 Critical
» 23 Nov 2015 15:09:11.085 2015-11-23 20:09:10.859478+00:00 heroku web.1 - - State changed from up to crashed