Uncaught TypeError: ctx is undefined

[mdocter]

When running this repo I get a blank screen and an error in the console "Uncaught TypeError: ctx is undefined".

Steps to reproduce:

1. Clone this repository;
2. Run npm install;
3. Run npm run serve;
4. Open the bowser and go to http://localhost:8080 as suggested from the console;
5. Open the browser developer tools console and see the error.

@aravindravi5230 Any idea what could be causing this?