Spotify duplicate app open

[catalinv]

Plan

Premium

Country

Romania

Device

Laptop

Operating System

Linux Mint 18

My Question or Issue

If I have an opened Spotify, if I forget about it and start Spotify again, I gen a second window. This shouldn't happen. If I close both and then start Spotify again, my media buttons won't work until I restart the whole system. Please make Spotify have only one open instance at a time.

[enanajmain]

Why is this issue still not solved? Does the company care so little for its users?