Remove button in tray doesn't work and clicking demo button again doesn't remove tray icon

[mooocer]

The apps says Click demo again to remove but clicking it creates a new icon.

As visible above, multiple icons get created for each time the demo button was clicked. It should've instead closed the tray icon as specified.

I started the app from terminal due to this.

• What operating system are you using?
  Ubuntu 18.04

• What version of Node.js is on your system?
  v12.13.0