Granite jQuery csrf error

Hi,

Our site in AEM (6.2) uses the bundled jQuery inside Granite.

From what I see, the generated granite.js file consists of the csrf.js.

Currently, when a page loads, it is throwing an error in the browser console of:

Uncaught TypeError: Cannot read property 'externalize' of undefined(...) getToken    @ csrf.js:103

The line that it's referring to in the csrf.js is:

xhr.open('GET', Granite.HTTP.externalize(TOKEN_SERVLET), true);

I'm not sure what is causing this (and what it's supposed to be doing even) as it seems to have been included without our explicitly including this.

Can anyone help explain and how to fix?

Thanks in advance!