Email Delivery Error: ‘from’ parameter is missing

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WordPress automatically updated to version 5.2.2 today.

So it tried to send me this email: “Your site has updated to WordPress 5.2.2”, but it failed with this error:

EMAIL DELIVERY ERROR: the plugin WP Mail SMTP v1.4.2 logged this error during the last time it tried to send an email:

Mailer: Mailgun
‘from’ parameter is missing

I had this error before, I only got it when WordPress automatically updated and tried to send the update success email.

So I installed the WP Mail Log plugin a few weeks ago in order to see if there is any error. Today can see the “Your site has updated to WordPress 5.2.2” email there in the log, but no error is shown.

What should I do now?