Critical Error on Legacy Widget Preview

Good day!

There is an error caught on the site – https://www.screencast.com/t/zU4AopSBN. I did a plugin conflict test and see that the Kirki Customizer Framework plugin causes it.

We are using https://themeforest.net/item/realtyspace-real-estate-wordpress-theme/15965811 on the site. All updated from WordPress to plugins.

Can you kindly advise?
Thank you so much!