On page tiki-stats.php, if the start and end dates for "Most viewed objects in period" are equal or if the start date is AFTER the end date, no error is given and the section disappears when he screen is reloaded after pressing the Filter button.
(I have attached before and after images but can't but work out with the "Choose or upload images" icon on this input field "Description" how to include them. Sorry.)
Since a new show instance will have no history when initially created, I can't immediately demonstrate it here.
However using the show instance from another of the issues I've previously reported, I see the same behaviour ...