I asked Proton about this question, and this is what they told me, "ProtonVPN has no logs on our VPN servers, but on the user device, there are error logs. However, those logs are not sent to us, and exist only on the user's device. If the user runs into problems and needs help from our support team to debug an issue, then the user can chose to send us the logs for us to help with resolving issues."
Also, i noticed in the app description it says it doesn’t log ever, but in the app’s settings it has a log.
I asked Proton about this question, and this is what they told me, "ProtonVPN has no logs on our VPN servers, but on the user device, there are error logs. However, those logs are not sent to us, and exist only on the user's device. If the user runs into problems and needs help from our support team to debug an issue, then the user can chose to send us the logs for us to help with resolving issues."