Snapshot remove from disk but still in logical path

[dingdingdong]

While the VM is running, I remove a snapshot. The removed snapshot is a parent snapshot of the running state. The snapshot is removed from disk but is still in the virtual media tree. In consequence the VM can't be started because the media (deleted) can't be read

I tried to remove the media from the media manager, but the manager can't removed from the list because this media has 1 child.

How can I solve this problem and rescue the VM (the snapshot removed is a very old one and i need to restore on of his child).

[dingdingdong]

The Version of VM Box is 6.0 and not 6.1.16