New version of Pro caused error

For info … the new version of Pro caused an error which triggered my first ever WP ‘fatal error detection’ email.

My site died for a few seconds but, interestingly, then recovered.

This is what was emailed to me as the cause:

Error Details
=============
An error of type E_ERROR was caused in line 86 of the file /www/headforpoints_607/public/wp-content/plugins/ad-inserter-pro/includes/update-checker/Puc/v4p4/Factory.php. Error message: Uncaught Error: Class ‘Puc_v4p4_Plugin_UpdateChecker’ not found in /www/headforpoints_607/public/wp-content/plugins/ad-inserter-pro/includes/update-checker/Puc/v4p4/Factory.php:86
Stack trace:
#0 /www/headforpoints_607/public/wp-content/plugins/ad-inserter-pro/includes/functions.php(1136): Puc_v4p4_Factory::buildUpdateChecker(‘https://updates…’, ‘/www/headforpoi…’, ‘ad-inserter-pro’)
#1 /www/headforpoints_607/public/wp-content/plugins/ad-inserter-pro/ad-inserter.php(7979): ai_hooks()
#2 /www/headforpoints_607/public/wp-settings.php(362): include_once(‘/www/headforpoi…’)
#3 /www/headforpoints_607/public/wp-config.php(80): require_once(‘/www/headforpoi…’)
#4 /www/headforpoints_607/public/wp-load.php(37): require_once(‘/www/headforpoi…’)
#5 /www/headforpoints_607/public/wp-admin/admin.php(34): require_once(‘/www/headforpoi…’)
#6 /www/headforpoints_607/public/wp-admin/plugin-install.php(16): require_once(‘/www/headforpoi…’)
#7 {main}
thrown