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We just migrated from the old Purchases pod (version 3.13.1) to the new RevenueCat (version 4.11.0).

In didFinishLaunchingWithOptions method we are configuring RevenueCat as follows:

let purchases = Purchases.configure(
    with: Configuration.Builder(withAPIKey: "???")
        .with(observerMode: true)
        .build()
)

let instanceID = Analytics.appInstanceID()
purchases.attribution.setFirebaseAppInstanceID(instanceID)
if instanceID == nil {
    // Track error
}

Until now, 5% of our users using iOS 12/iPadOS 12 are getting this crash 


Crashed: com.apple.main-thread
0  libswiftCore.dylib             0x204ba0 specialized _assertionFailure(_:_:file:line:flags:) + 360
1  libswiftCore.dylib             0x282bc _assertionFailure(_:_:file:line:flags:) + 32
2  libswiftFoundation.dylib       0xa3d10 @objc static NSObject.__old_unswizzled_keyPathsForValuesAffectingValue(forKey:) + 84
3  libswiftFoundation.dylib       0xa436c static __KVOKeyPathBridgeMachinery.keyPathsForValuesAffectingValue(forKey:) + 272
4  libswiftFoundation.dylib       0xa4864 @objc static __KVOKeyPathBridgeMachinery.keyPathsForValuesAffectingValue(forKey:) + 88
5  Foundation                     0x9d58 -5NSKeyValueUnnestedProperty _givenPropertiesBeingInitialized:getAffectingProperties:] + 196
6  Foundation                     0x9a5c -5NSKeyValueUnnestedProperty _initWithContainerClass:key:propertiesBeingInitialized:] + 148
7  Foundation                     0xfcb9c NSKeyValuePropertyForIsaAndKeyPathInner.llvm.8205242823520915647 + 288
8  Foundation                     0xfd374 NSKeyValuePropertyForIsaAndKeyPath + 140
9  Foundation                     0xfbbe0 _NSKeyValueCreateImplicitObservationInfo + 224
10 Foundation                     0x1d174 -7NSOperation init] + 372
11 MyApp                    0x40c2f4 specialized NetworkOperation.init(configuration:) + 79 (NetworkOperation.swift:79)
12 MyApp                    0x37d700 specialized GetOfferingsOperation.init(configuration:offeringsCallbackCache:) + 4303165184 (<compiler-generated>:4303165184)
13 MyApp                    0x3a2bd8 OfferingsAPI.getOfferings(appUserID:withRandomDelay:completion:) + 4303317976 (GetOfferingsOperation.swift:4303317976)
14 MyApp                    0x3d11d8 closure #1 in Purchases.updateAllCaches(completion:) + 4303507928 (<compiler-generated>:4303507928)
15 MyApp                    0x40dc6c closure #1 in SystemInfo.isApplicationBackgrounded(completion:) + 126 (SystemInfo.swift:126)
16 MyApp                    0x7ed38 thunk for @escaping @callee_guaranteed () -> () + 4300025144 (<compiler-generated>:4300025144)
17 libdispatch.dylib              0x5fa38 _dispatch_call_block_and_release + 24
18 libdispatch.dylib              0x607d4 _dispatch_client_callout + 16
19 libdispatch.dylib              0xe008 _dispatch_main_queue_callback_4CF$VARIANT$mp + 1068
20 CoreFoundation                 0xaab20 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 12
21 CoreFoundation                 0xa5a58 __CFRunLoopRun + 1924
22 CoreFoundation                 0xa4fb4 CFRunLoopRunSpecific + 436
23 GraphicsServices               0xa79c GSEventRunModal + 104
24 UIKitCore                      0x8bcc38 UIApplicationMain + 212
25 MyApp                    0x1b3ec main + 16 (main.m:16)
26 libdyld.dylib                  0x18e0 start + 4

 

 

Please, let me know if I am doing something wrong or if I can add more useful information.

Thanks!

Avoid calling the SDK config in your didFinishLaunchingWithOptions, move it late, in my case I moved it when I created the tab controller, in yours maybe your first view controller.  This will avoid other issues down the road and maybe it will fix this.

Thank you @imougy!

I can try that out in a following release… I think it won’t introduce any issue. Anyway, the documentation states here that you can call it in that method (in my case, the user is not indentified so there is no problem with that). That’s why I did it there.

Thank you @imougy!

I can try that out in a following release… I think it won’t introduce any issue. Anyway, the documentation states here that you can call it in that method (in my case, the user is not indentified so there is no problem with that). That’s why I did it there.

True about the documentation but since iOS 15, Apple made a major changed that can have major effect if you init in the ‘didFinishLaunchingWithOptions’.  Here is Apple link for details (please pay attention to the “Prepare your app for prewarming”) but take my word for it, init later to avoid random failures.

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