onAdditionalData error what's the problem?

Question

ASP.NET

there is a button on the page - (add)
When you click on the button, in the page log (when viewed through the browser - F12), it throws an error onAdditionalData.
I do not see such a function on any page.

Answer 1

In general, the problem was in a repeating script on different views that tried to display different values.