2.3.0 update caused fatal error

After the klaviyo 2.3.0 update today, my site experienced a critical error: “There has been a critical error on your website.”

This is the specific error behind the scenes:

PHP Fatal error: Uncaught Error: Call to undefined function is_checkout() in /srv/htdocs/wp-content/plugins/klaviyo/inc/kla-analytics.php:29

I have disabled the klaviyo plugin for now, but it’s really disappointing to see a plugin update take down sites.