Problem with external Cloud




i've got a problem with my Owncloud 9 instance.
With my Account i added a sharing with another owncloud instance...
But theres a problem with this instance and its forever down...
Now my instance searches for this cloud, so my account loads extremly slow...
I cant delete the sharing in the front end...
is there any way to delete this sharing
Maybe on terminal or is there also another way?

I'm using an up to date owncloud instance on an Ubuntu 16.04 distributon with PHP 7



Normally, you just click on the trashbin of the shared folder and it will be unshared (currently you can't undo this).