App crashes on @main

It’s likely that the crash occurred deep in some library code and Xcode is showing you the first frame in the backtrace for which it has source code. That doesn’t give you any insight into what’s causing the crash.

If you run your app from outside Xcode — from the Home screen if it’s an iOS app, from the Finder if it’s a Mac app, and so on — does it still crash? If so, that should generate a crash report. Grab that and post it here.

See Posting a Crash Report for advice on how to post your crash report.

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

Hi, yes. It crashes while in testflight, released version, and xcode simulator. I still cannot find what's causing it :/ but I know how to reproduce it. It's after I click login when signing in. I refactored the whole function and it's working fine, but the error is there... Here's the crash log generated, It would mean a lot if you could help me find what's the issue, this random crash is driving me crazy..

For what I see there it says Segmentation fault but coming from where? Who's causing it?

coming from where?

Your second example shows that clearly:

0  SwiftUI … _OUTLINED_FUNCTION_66 + 16
1  SwiftUI … $s7SwiftUI4TextV7resolve4into2in4withyxz_AA17EnvironmentValuesVAC14ResolveOptionsVtAA08ResolvedC9C…
2  SwiftUI … $s7SwiftUI19UIHostingControllerC12promoteTitle2inyAA17EnvironmentValuesV_tFAA19_ConditionalContent…
3  SwiftUI … partial apply for specialized closure #1 in UINavigationController.updateRootHost<A>(root:environm…
4  SwiftUI … CustomGraphMutation.apply() + 28 (GraphHost.swift:696)
5  SwiftUI … AsyncTransaction.apply() + 192 (GraphHost.swift:727)
6  SwiftUI … GraphHost.flushTransactions() + 288 (GraphHost.swift:517)
7  SwiftUI … specialized closure #2 in UINavigationController.updateRootHost<A>(root:environment:transaction:) …
8  SwiftUI … thunk for @escaping @callee_guaranteed () -> () + 28 (<compiler-generated>:0)
9  SwiftUI … static Update.end() + 600 (<compiler-generated>:0)
10 SwiftUI … static NSRunLoop.flushObservers() + 172 (StandardLibraryAdditions.swift:832)
11 SwiftUI … closure #1 in closure #1 in static NSRunLoop.addObserver(_:) + 16 (StandardLibraryAdditions.swift:…

I looks like this code is running as a run loop observer installed by SwiftUI (frame 16). It’s in the process of flushing transactions to the view hierarchy (frame 6) and something in that code has crashed by accessing bad memory.

Unfortunately I don’t know enough about SwiftUI’s internals to offer insight beyond that. If no one else chimes in, I recommend that you open a DTS tech support incident and talk to one of our SwiftUI experts.

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

he @afern247 how did you resolve this matter? I have the same problem.

I also have the same problem. Has any solution been found?