Getting error `builder/class-mfn-builder-front.php on line 317` and content of page has disappears.

edited September 2019 in Muffin Builder
Until yesterday all right, but when i try to edit my home page today i getting the following error: `Notice: Undefined index: in /var/www/html/wp-content/themes/betheme/functions/builder/class-mfn-builder-front.php on line 317`

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