WordPress has a built-in feature that detects when a plugin or theme causes a fatal error on your site, and notifies you with this automated email.
In this case, WordPress caught an error with your theme, TaskHive.
First, visit your website and check for any visible issues. Next, visit the page where the error was caught (…/wp-admin/admin-ajax.php) and check for any visible issues.
Any suggestion on why this happened and how to prevent it in the future?
The theme itself doesn’t send any requests to the admin-ajax.php file, we use REST API instead (another way to process requests) - maybe some third-party plugin send this request? You can check the PHP error log and post the detailed error here.
P.S. If you purchased a theme or extension, please enter the license key in the forum profile settings, this will enable the Premium Support badge and ensure a 24-hour turnaround time.