为什么我的UISearchDisplayController访问非法单元/ indexPath?

I have a table view with a search bar. Initially, the table view shows all (10) items. When I select a cell, a detail view is pushed on the navigation controller stack, and I can then go back to the table view by tapping the Back button. As long as I have not entered a search text yet, the table view shows all items, and I can go back and forth between the detail view and the table view indefinitely.I have a table view with a search bar. Initiall