Address size fault crash on iPhone 12 (built w/ React Native)

The main cause of the crash is apparently an Address size fault error. I have attached the .crash file for the full log.

How did you come to that conclusion?

Looking at your crash report I see the standard stuff in apps like this. Your app has crashed due to an unhandled language exception that’s being thrown by RCTFatal.

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

My apologies, I misread the crash report. You're right, the crash seems to be caused by an exception thrown by RCTFatal. Unfortunately, I can't seem to retrieve any logs prior to the occurrence of the fatal error. I haven't been able to identify the cause of the unhandled language exception since I cannot reproduce it. I also only have 1 crash report available to view in XCode.

How can I troubleshoot further? Now that I know the crash is coming from frame 2 in the Last Exception Backtrace (RCTFatal + 668) what are some things that I could look for to help narrow this down?

Thanks for your response.

How can I troubleshoot further?

As an Apple person I don’t have a lot more to offer you here. The answers you seek may lie within the third-party runtime you’re using, but I don’t have any expertise in that. You may have better luck escalating this via its support channel.

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

I can see some methods and interfaces starting with RCT*** meaning that you have a react native app.

The exception is thrown at RCTFatal + 668 (RCTAssert.m:146) so I guess it asserts ie checks some of the codes in react native and then throws exception.

You might have an undefined string passed to text component or string in a checkbox etc. This is most probably an exception from your react native code so i'd double check that.