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On safari when you click erase your history you can open the index html file without the FetchEvent.respondWith received an error: Returned response is null error but then you get this screen that says Not Found idk it’s a reality error screen link to website the glitch only works on mobile safari website linke here → https://3kh0--xcxcvbnio0.repl.co/
Welcome @tc22595! I wanted to let you know I did test this on my Mac and my colleague tested on this iPhone as well, but Safari did not have any errors for us in our testing.
Are you still having this issue? If you have another device or a friend who has an iPhone or iPad, maybe another test would be good to see if it’s specific to a certain device or Safari browser. We can try clearing cache as well. I’d be interesting in hearing more about your reproduction steps or if you could provide a screen recording/clip.
Let us know how it goes or if you need more help.