I’ve gone through this already. As far as I am able to figure out my PHP 7 is giving an error message on the 404 page (404.php)
<b>Warning</b>: Creating default object from empty value in <b>/homepages/22/d485301295/htdocs/blog/wp-content/plugins/auto-pagination/auto-pagination-functions.php</b> on line <b>76</b><br />
System Status of PLP is giving me a warning as well:
Pagination Function: File not Found
You’ll want to verify your theme uses the wp_link_pages function, which is the preferred, best-practices WP pagination function.
Usually, this function appears in the single.php template, but it might also be elsewhere. If your theme doesn’t include this function, you’ll want to swap it in.
We are using Twenty Fourteen out of the box and the is no wp_link_pages function in single.php. For the rest plp is working as expected.