new built-in feature to detect fatal errors

My customer received the following email. All of her plugins, themes, WordPress, PHP, etc., are current, and the gallery section seems to be functioning normally. Any tips on what we should do are appreciated. Thanks! Email pasted below with personal information removed:

Howdy!

Since WordPress 5.2 there is 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 one of your plugins, FooBox Image Lightbox.

First, visit your website (URL here) and check for any visible issues. Next, visit the page where the error was caught (domainname.com/wp-login.php) and check for any visible issues.

Please contact your host for assistance with investigating this issue further.

If your site appears broken and you can’t access your dashboard normally, WordPress now has a special “recovery mode”. This lets you safely login to your dashboard and investigate further.

(URL here)

To keep your site safe, this link will expire in 1 day. Don’t worry about that, though: a new link will be emailed to you if the error occurs again after it expires.

Error Details
=============
An error of type E_ERROR was caused in line 49 of the file /home/name/public_html/wp-content/plugins/foobox-image-lightbox/freemius/require.php. Error message: Out of memory (allocated 10485760) (tried to allocate 126976 bytes)