It's both. as mention other places though, missing window.ga at all on other sites can cause worse problems. I'm not sure mimicing the whole api is useful, but

It's both. as mention other places though, missing window.ga at all on other sites can cause worse problems. I'm not sure mimicing the whole api is useful, but maybe not adding the stub on teespring will be. On teesprings side, it's not their fault, but adding '&& window.ga.getAll' will fix the issue