Latest Logos Bible app; latest ios on a mini4.
Off-line, if you click on a reference to another book that isn't downloaded, the app happily opens a panel, of course can't find the resource, and presents a blank page.
The problem, is there's no exiting the blank page (ie touching the page to get the various menus). Best I could do, was remove the app from memory, restart, and then delete the blank panel.
In the example below, I selected a reference from DCH volume 9:
