Updates kill Site

The last two times I updated your plugin I got an error message and have to have the host team deactivate the update and then I can go in and reactivate the old plugin to get access. What am I doing wrong to get this error?

The latest error is:
Warning: Attempt to read property “feeds” on null in /home/piercecounty/www/www/wp-includes/post.php on line 5016

Fatal error: Uncaught Error: Call to a member function get_page_permastruct() on null in /home/piercecounty/www/www/wp-includes/link-template.php:431 Stack trace: #0 /home/piercecounty/www/www/wp-includes/link-template.php(393): _get_page_link(Object(WP_Post), false, false) #1 /home/piercecounty/www/www/wp-includes/link-template.php(197): get_page_link(Object(WP_Post), false, false) #2 /home/piercecounty/www/www/wp-includes/post.php(4552): get_permalink(Object(WP_Post)) #3 /home/piercecounty/www/www/wp-content/plugins/custom-registration-form-builder-with-submission-manager/includes/class_rm_utilities.php(476): wp_insert_post(Array) #4 /home/piercecounty/www/www/wp-content/plugins/custom-registration-form-builder-with-submission-manager/includes/class_rm_activator.php(124): RM_Utilities::create_submission_page() #5 /home/piercecounty/www/www/wp-content/plugins/custom-registration-form-builder-with-submission-manager/includes/class_rm_activator.php(34): RM_Activator::setup_submission_page(false) #6 /home/piercecounty/www/www/wp-includes/class-wp-hook.php(308): RM_Activator::activate(false) #7 /home/piercecounty/www/www/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(”, Array) #8 /home/piercecounty/www/www/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #9 /home/piercecounty/www/www/wp-admin/includes/plugin.php(691): do_action(‘activate_custom…’, false) #10 /home/piercecounty/www/www/wp-content/plugins/registrationmagic-premium-1-1/registration_magic_addon.php(114): activate_plugin(‘custom-registra…’) #11 /home/piercecounty/www/www/wp-content/plugins/registrationmagic-premium-1-1/registration_magic_addon.php(135): check_rm_addon_requirements() #12 /home/piercecounty/www/www/wp-settings.php(447): include_once(‘/home/piercecou…’) #13 /home/piercecounty/www/www/wp-config.php(88): require_once(‘/home/piercecou…’) #14 /home/piercecounty/www/www/wp-load.php(50): require_once(‘/home/piercecou…’) #15 /home/piercecounty/www/www/wp-admin/admin.php(34): require_once(‘/home/piercecou…’) #16 {main} thrown in /home/piercecounty/www/www/wp-includes/link-template.php on line 431

The page I need help with: [log in to see the link]