ARTICLE AD BOX
My app crashes on iOS 26.3.1 (a) only (cannot reproduce on earlier versions) with the following crash type:
Crashed: com.apple.main-thread
0 libsystem_pthread.dylib thread_chkstk_darwin + 60
1 libsystem_pthread.dylib ___chkstk_darwin + 60
2 libswiftCore.dylib KeyedEncodingContainerProtocol.encodeIfPresent<A>(_:forKey:) + 272
3 Foundation <deduplicated_symbol> + 36
4 libswiftCore.dylib _KeyedEncodingContainerBox.encodeIfPresent<A, B>(_:forKey:) + 372
5 libswiftCore.dylib KeyedEncodingContainer.encodeIfPresent<A>(_:forKey:) + 76
...
27 Foundation specialized __JSONEncoder.wrapGeneric<A, B>(_:for:) + 4916
28 Foundation JSONEncoder.encode<A>(_:) + 296
The pattern repeats encodeIfPresent → encodeIfPresent multiple times before the overflow. The crash originates from a JSONEncoder.encode() call triggered from the main thread via an Alamofire response callback.
Stack trace (simplified)
Frame 34: TransferFundsVM.validateAndSubmit(data:processId:) (TransferFundsVM.swift:1112)
Frame 35: closure in TransferFundsViewModel.fetchTransfer(type:processId:) (TransferFundsVM.swift:1087)
Frame 28: JSONEncoder.encode<A>(_:) + 296 ← crash here
Frame 0: thread_chkstk_darwin ← stack overflow
