Synchronous XMLHttpRequest Error

I'm getting the following error when enabling the simpleads module on my remote Drupal installation.

Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check http://xhr.spec.whatwg.org/.

After which, the SimpleAds module reinserts the entire web page inplace of my image Ad and breaks the page and freezes it. How do I fix this? From what I have seen online the error has to do with sending Synchronous ajax requests and the suggestions claim that setting async option of a jquery ajax call to true should solve the problem. I've tried to find these usages in SimpleAds (.js files in the module) but couldn't find none.

Any suggestions would be highly appreciated.