Blocking Google Analytics prevents Checkout

[emmathepossum]

Preconditions

1. Magento 2.2.1
2. PHP 7.0.25-1~dotdeb+8.1
3. mysql Ver 15.1 Distrib 10.0.32-MariaDB
4. uBlock Origin 1.14.18 on client

Steps to reproduce

1. Enable Google Analytics in Stores > Settings > Configuration > Sales >Google API
2. Install uBlock Origin on client, or block Google Analytics in any other AdBlocker
3. Go to Checkout

Expected result

1. Checkout is working

Actual result

1. Checkout is loading infinitely

The rest of the site works fine. Apparantly the checkout just cannot handle any errors and will stop functioning immediately.

GET http://example.com/pub/static/frontend/Magento/luma/en_US/Magento_GoogleAnalytics/js/google-analytics.js net::ERR_BLOCKED_BY_CLIENT

[magento-engcom-team]

@dwirt, thank you for your report.
We've created internal ticket(s) MAGETWO-84475 to track progress on the issue.

[lingwooc]

This seems to be related to #13061 and #12828 . The pr doesn't appear to fix this issue though.

Even if you replace the x-magento-init block in Magento_GoogleAnalytic\view\frontend\templates\ga.phtml with...

<script type="text/javascript">
require(["Magento_GoogleAnalytics/js/google-analytics"], function (analytics){
        analytics({
            "isCookieRestrictionModeEnabled": <?= (int)$block->isCookieRestrictionModeEnabled() ?>,
            "currentWebsite": <?= (int)$block->getCurrentWebsiteId() ?>,
            "cookieName": "<?= /* @escapeNotVerified */ \Magento\Cookie\Helper\Cookie::IS_USER_ALLOWED_SAVE_COOKIE ?>",
            "ordersTrackingData": <?= /* @escapeNotVerified */ json_encode($block->getOrdersTrackingData()) ?>,
            "pageTrackingData": <?= /* @escapeNotVerified */ json_encode($block->getPageTrackingData($accountId)) ?>
        });},
        function(err) {
            console.warn(err);
        }
    );
</script>

...which shouldn't be able to kill any javascript flow, checkout-loader is still not cleared and the checkout doesn't work.

Error thrown is:

GET ####/en_GB/Magento_GoogleAnalytics/js/google-analytics.js net::ERR_BLOCKED_BY_CLIENT require.js:1895 

Caught error (printed as a warning is:

(index):261 Error: Script error for: Magento_GoogleAnalytics/js/google-analytics
http://requirejs.org/docs/errors.html#scripterror
    at makeError (require.js:166)
    at HTMLScriptElement.onScriptError (require.js:1681)

I'm not sure I understand requirejs enough to work out whats going wrong. I assume the error thrown by require.js:1895 which is not caught (?) is the culprit but I can't see how.

Just commenting out the script fixes the cart, so it doesn't have to load to work.