Steps to reproduce
From any document, do a search that may or may not have any results (really immaterial of if there are results or not. As long as you get the results screen).
From the results screen, hit the back icon next to the search term (the Dynalist one, not the android navigation back).
Expect to go back to the previously opened document.
Get "No document is open" display.
Android (8.0). Dynalist beta (1.1.16)
In addition the the behaviour above. When on the "no Document Open" window. You are unable to hit the magnifying glass to perform another search. There is no result from pressing the button.