VK API | Javascript SDK + Execute method with multiple api calls + captcha - How to process?

Question

JavaScript

Application type - iframe
using Javascript SDK for VK API
When executing the execute method with the code:

var a=[];
var obj={};
obj = API.audio.search({"q": "Ыsз", "auto_complete:1":1, "count":1});obj.search="Ыsз";a.push(obj);
obj = API.audio.search({"q": "77т", "auto_complete:1":1, "count":1});obj.search="77т";a.push(obj);
...
obj = API.audio.search({"q": "оyt", "auto_complete:1":1, "count":1});obj.search="оyt";a.push(obj);
return a;

sometimes a window appears with a suggestion to enter a captcha.
If this window is closed, then (else block) is executed in the code

VK.api("execute",{code:code},function(data) { 
  if (data.response) { 
    console.info("EXECUTE OK:",data);
  } else {
    console.error("EXECUTE ERROR:",data);
  }
});

And if you enter the correct captcha in this window, then the previous code is not executed, an error occurs somewhere above:

VM163:1 Uncaught SyntaxError: Unexpected token <
done @ apps.js?276:943
r.onreadystatechange @ common.js?1124_163:3049

TP Vkontakte answered as follows:
You receive the data necessary for processing the error. The processing scheme is described here: vk.com/dev/captcha_error
Question: How to correctly catch the capcha needed error in the Execute method?