Confirmation emails not going out to applicants on submission

Hello,

Our client uses ApplyOnline to handle job applications on their site. It’s working for the most part, but there are currently two issues they’ve reported since the latest update.

1. Confirmation emails aren’t going out to applicants when they submit a job application, the job applications still go through fine. In testing this issue, I discovered issue 2.
2. Any tab besides General under ApplyOnline -> Settings can’t be clicked. This triggers the following Fatal error in the error.log file:
   
   PHP Fatal error: Uncaught Error: Value of type null is not callable in /var/www/clients/client1/web1/web/wp/wp-content/plugins/apply-online/admin/class-applyonline-admin.php:1575\nStack trace:\n#0 /var/www/clients/client1/web1/web/wp/wp-includes/class-wp-hook.php(324): Applyonline_Settings->settings_page_callback()\n#1 /var/www/clients/client1/web1/web/wp/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters()\n#2 /var/www/clients/client1/web1/web/wp/wp-includes/plugin.php(517): WP_Hook->do_action()\n#3 /var/www/clients/client1/web1/web/wp/wp-admin/admin.php(259): do_action()\n#4 {main}\n thrown in /var/www/clients/client1/web1/web/wp/wp-content/plugins/apply-online/admin/class-applyonline-admin.php on line 1575′
   

I can’t be certain if the fatal error related to the settings tabs is related to the confirmation emails not going out to applicants, but I’m hoping if you can resolve the null error in class-applyonline-admin.php on line 1575, it might help.

Please let me know if you have any other ideas about what could be causing the issue with applicant emails to not send or if you need any more information to help with this.

Cheers