Stuck on exercise tracker

Tell us what’s happening:
Describe your issue in detail here.

I am creating user and exercise with correct response, but the log for user fails to show up. Error message says:

TypeError: Cannot read property 'username' of undefined
    at getUsernameById (/app/server.js:19:68)
    at app.get (/app/server.js:74:15)

Your project link(s)

solution: Glitch :・゚✧

code: Glitch :・゚✧

Your browser information:

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.36

Challenge: Exercise Tracker

Link to the challenge:

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