NodeJS : TypeError: Cannot read property 'userAgent' of undefined error on node.js app run

To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

As promised, I'm going to share a hidden feature with you.
This is a YouTube's feature which works on Desktop.
First, Make sure this video is playing.
Then, type the letters 'awesome' on your keyboard as the next step.
Your YouTube progress bar will transform into a flashing rainbow.

A brief introduction of myself,
Hey there, I am Delphi, pleased to make your acquaintance.
I help you answer your questions.
Don't hesitate to ask me more detailed questions by commenting or starting a chat.
Don't hesitate to provide your answer or insights by leaving a comment below.
If you provide an answer, I will 'heart' it as a sign of gratitude.