Thanks for this information.
Developing and testing under PHP 7.0, I missed somehow an earlier PHP versions.
Quick workaround – replace line 64 at /wp-content/plugins/user-role-editor-pro/pro/includes/classes/page-permissions-view.php
$capability = array_values($caps);
with this version:
$caps_list = array_values($caps); $capability = $caps_list;
Or rollback to previous version and wait an updated version. I will publish it next 1-2 weeks.