HELP!! PHP Warning: Undefined array key "content"

I need you to help me urgently.
I had a form that worked perfectly. Suddenly, out of nowhere, he charges me blank. I search the log and find the following:

PHP Warning: Undefined array key "content" in /administrator/components/com_chronoforms7/chronoforms/helpers/field.php on line 436

Could you help me find out what could be happening?

Basically I know the problem. This happened to me again and again when I moved buttons in the backend, for example. It was usually enough to push the button back again. However, I often had to restore a backup of the table.