I used to enable Last.fm scrobbling on Spotify Android app. Because it does not scrobble songs that I listened to offline, I started using Last.fm Android app for scrobbling. To avoid double scrobbling, I wanted to disable it on Spotify app and logged out from the Last.fm account. Every time I opened Spotify app, however, I am getting Last.fm Error: Wrong username or password. The reason is that it tries to log in to my account but there is no password. Last.fm scrobbling seems active. So, there is actually no way to disable Last.fm scrobbling. I tried to log out from Spotify and log in again, but it does not work, either. It is pretty annoying.