App doesn't load on Safari

[YoniH]

My app loads fine in Chrome, but on Safari the page takes forever to load and never finishes. All I see is a blank white screen.

Looking at Safari's network tab of the web inspector, it seems that bundle.js sometimes is loaded (I get 200) and sometimes not (still pending, forever). This way or another, the clock that shows page load time keeps running forever.

I thought this might somehow be related to service worker, but the same happens after disabling service worker (assuming I disabled it correctly. I followed the instructions).

I'm not ejected, using react-scripts 1.1.4.

Any ideas?

[YoniH]

Problem solved.
I used .finally() on a promise, which is not supported in Safari, and that caused a crash.
The app had a crash reporter, which for some reason prevented the page from loading completely.