Calling Google-Analytics throws Uncaught ReferenceError

When calling Google-Analytics throws a (index):151 Uncaught ReferenceError: ga is not defined, check if your AdBlock blocks user tracking. If the error remains, check if your Google-Analytics Code-Inclusion is up to date.

For conversion tracking you may need to include a special Google library for that:

page.includeJS {
    conversion_async = //www.googleadservices.com/pagead/conversion_async.js
    conversion_async.external = 1
}