We have a huge problem now after upgrading to 2.0 and it is that people can’t unsubscribe. When people click on the unsubscribe link they get this.
"Uh oh! I think I broke it. If I do it again, please report me to the system administrator! "
500 Internal Server Error
Fix https://github.com/mautic/mautic/pull/1986
and https://github.com/mautic/mautic/issues/1983 will solve this problem, confirmed and worked 
Yes I run a backup before the upgrade and I downloaded the upgrade.php and run that from the server.
best regards Martin
Ok so I found this and applied it https://github.com/mautic/mautic/pull/1986
It almost worked, the contact is unsubscribed and don’t get any more emails great so far
but unsubscribe page is still showing 500 Internal Server Error
Did you upgrade from the panel or manually? Also do you have backups before installing the new version?
We have a huge problem now after upgrading to 2.0 and it is that people can’t unsubscribe. When people click on the unsubscribe link they get this.
"Uh oh! I think I broke it. If I do it again, please report me to the system administrator! "
500 Internal Server Error