[Plugin: Auto Prune Posts] out of memory

When I activate this plugin and I go to the post page (/wp-admin/edit.php) I get an out of memory error

Fatal error: Out of memory (allocated 87031808) (tried to allocate 32 bytes) in /home/ryanmc/public_html/deals/wp-includes/meta.php on line 567

https://www.ads-software.com/extend/plugins/auto-prune-posts/