ProtonVPN - update

LANG=C sudo apt-get update
Get:1 http://security.debian.org/debian-security buster/updates InRelease [65.4 kB]
Get:2 http://httpredir.debian.org/debian buster-updates InRelease [51.9 kB]
Hit:3 http://linux.teamviewer.com/deb stable InRelease
Ign:4 http://repo.vivaldi.com/stable/deb stable InRelease
Ign:5 http://linux.dropbox.com/debian buster InRelease
Hit:6 http://httpredir.debian.org/debian buster InRelease
Hit:7 http://download.virtualbox.org/virtualbox/debian buster InRelease
Hit:8 http://download.opensuse.org/repositories/graphics:/darktable/Debian_10  InRelease
Hit:9 https://dl.winehq.org/wine-builds/debian buster InRelease
Hit:10 http://repo.vivaldi.com/stable/deb stable Release
Get:11 http://linux.dropbox.com/debian buster Release [6600 B]
Hit:12 https://updates.signal.org/desktop/apt xenial InRelease
Get:13 http://httpredir.debian.org/debian buster-backports InRelease [46.7 kB]
Hit:14 http://download.opensuse.org/repositories/home:/Provessor/Debian_10  InRelease
Hit:15 https://deb.opera.com/opera-stable stable InRelease
Get:16 https://repo.protonvpn.com/debian unstable InRelease [2521 B]
Hit:17 http://download.opensuse.org/repositories/home:/smplayerdev/Debian_10  InRelease
Hit:18 https://packages.riot.im/debian default InRelease
Hit:19 http://download.opensuse.org/repositories/home:/strycore/Debian_10  InRelease
Fetched 173 kB in 3s (55.6 kB/s)
Reading package lists... Done
W: Skipping acquire of configured file 'main/source/Sources' as repository 'https://repo.protonvpn.com/debian unstable InRelease' does not seem to provide it (sources.list entry misspelt?)