Main site broke after using Cloner plugin

I tried cloning 'site 2'' to the 'main site' and now the main site is broken but all other sites on the multisite install are working. I was getting error after error during the copy so I closed the window. Now the main site is broken :slight_frown: .

The site now loads a random page and a menu (www.xxxx-xxxx). I need this page removed ASAP. How can I achieve this? Even if its just a blank page with a line of tekst as a temporary solution.

Next I would like to know how I can get the multisite navigation + main site up and running again?