How to remove Backbone extend Uncaught RangeError: Maximum call stack size exceeded error?

Question

JavaScript

I want to "overload" the function in the View object through the extend method like this:

window.ViewObject = window.ViewObject.extend( {
  functionName: function() {
    //new function code
  }
} );

I get the error Uncaught RangeError: Maximum call stack size exceeded
Didn't work tightly with the backbone, please help me with the implementation