Got it working again by doing the following:
- Have a look at the logs
- Enable Recovery Mode
- Open the Terminal
- Run
php command.php extension -l
to list all extensions - Uninstalled the Google Extension with
php command.php extension -u --name="Google Integration"
EspoCRM documentation for uninstalling via the terminal:
https://github.com/espocrm/documentation/blob/master/docs/administration/commands.md#extension