Javascript error in smartdocs pages

Hi All,

I am invoking API from Smartdocs page using Internet explorer and Chrome browsers.

While sending the request message we are getting this javascript error :

Internet Explorer:

SCRIPT5007: Unable to get property ‘responseText’ of undefined or null reference

Chrome:

Uncaught TypeError: Cannot read property ‘responseText’ of undefined at Object.success (model.js:143) at success (:3649:7) at onreadystatechange (:3606:7)

If you have encountered similar error then please advice