Crash on CardSession

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We are working on an HCE application following your documentation. Almost everything is working fine except that we encounter a crash when using CardSession.init() method.

We are calling CardSession.isEligible() before CardSession.init().

This crash is random and affects very few user and we did not find a way yet to reproduce this crash on our side.

Our theory is CardSession.isEligible() is doing thing under the hood and make CardSession.init() cause a crash, but that just our theory.

Here are some stacks :

CoreNFC/NFCCardSession.swift:431: Fatal error: Previous session exists

0   libswiftCore.dylib              0x000000019ed73800 _assertionFailure(_:_:file:line:flags:) + 168 (AssertCommon.swift:171)
1   CoreNFC                         0x000000025b99f630 NFCCardSession.startSession() + 296 (NFCCardSession.swift:431)
2   CoreNFC                         0x000000025b994771 CardSession.begin() + 1 (CardSession.swift:337)
3   CoreNFC                         0x000000025b99427d CardSession.init() + 1 (CardSession.swift:320)
4   Paiement Mobile                 0x000000010197f345 HceNativeSDK.startCardSession() + 1

Answer 1

Engineer OP

Apple

18h

Pretty sure CardSession.isEligible() is not doing anything to crash your app.

You will get this crashing error when you already have an active NFC session in your app. I would suggest to check that your code checks for previous sessions that may have not been closed, or perhaps a lingering variable holding the previous session that hasn't been released yet, etc.

In other words, this is a bug in your code you need to resolve. Not an issue caused by CardSession.isEligible()