Sorry for the delay getting back to you on this. In this case it was not a data related error, so I did not need to access your site (but thanks for sending the details). Please try replacement file “functions_print_lists.php” that is inside the attached zip folder. It replaces the file of the same name in the folder kiwitrees/includes/functions/
In my tests this resolved the issue completely, but please confirm if it also does so on your system.