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I am getting this after enabled plugin after long time and many updates on a blog of a multisite network:
There has been a critical error on your website. Please check your site admin email inbox for instructions.
Sites that plugin was enabled at these range is working fine.
Version: 2.2.1 – Network Deactivated
Apache Error Log:
AH01071: Got error 'rror: Uncaught Error: Call to a member function is_mailer_complete() on null in / xxxx/wp-content/plugins/wp-mail-smtp/src/Admin/Review.php:108\nStack trace:\n#0 / xxxx/wp-content/plugins/wp-mail-smtp/src/Admin/Review.php(78): WPMailSMTP\\Admin\\Review->review()\n#1 / xxxx/wp-includes/class-wp-hook.php(287): WPMailSMTP\\Admin\\Review->review_request('')\n#2 / xxxx/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array)\n#3 / xxxx/wp-includes/plugin.php(478): WP_Hook->do_action(Array)\n#4 / xxxx/wp-admin/admin-header.php(281): do_action('admin_notices')\n