TBH I don't see this as a TeeSpring problem - the code on their page guards against a realistic scenario (the GA script fails to load), but the "break" is caused by uBlock's changes.
The article's title is correct: ad block shouldn't break checkout. Injecting a bogus value into a global breaks checkout, so ad block shouldn't do that.
The article's title is correct: ad block shouldn't break checkout. Injecting a bogus value into a global breaks checkout, so ad block shouldn't do that.