EXC_BAD_ACCESS when starting app

[jleprinc]

I need to update the version of mixpanel-react-native and so the mixpanel-swift package to 4.2.5 to have the privacy manifest but when i do so I have a crash when starting the app:

Crashed: com.mixpanel.instance.manager.instance
0  libswiftCore.dylib             0x390994 swift::TargetMetadata<swift::InProcess>::getTypeContextDescriptor() const + 4
1  libswiftCore.dylib             0x3bab74 swift::SubstGenericParametersFromMetadata::SubstGenericParametersFromMetadata(swift::TargetMetadata<swift::InProcess> const*) + 36
2  libswiftCore.dylib             0x3c4630 swift_getAssociatedTypeWitnessSlowImpl(swift::MetadataRequest, swift::TargetWitnessTable<swift::InProcess>*, swift::TargetMetadata<swift::InProcess> const*, swift::TargetProtocolRequirement<swift::InProcess> const*, swift::TargetProtocolRequirement<swift::InProcess> const*) + 328
3  libswiftCore.dylib             0x3c26d4 swift_getAssociatedTypeWitness + 92
4  libswiftCore.dylib             0x195734 OptionSet<>.init() + 80
5  macadam                        0xf989c8 protocol witness for SetAlgebra.init() in conformance NSJSONReadingOptions + 52 (<compiler-generated>:52)
6  macadam                        0x14db168 protocol witness for SetAlgebra.init() in conformance NSJSONWritingOptions + 12
7  libswiftCore.dylib             0x1b3a60 SetAlgebra.init<A>(_:) + 492
8  macadam                        0x17243b4 protocol witness for SetAlgebra.init<A>(_:) in conformance NSJSONWritingOptions + 44 (<compiler-generated>:44)
9  libswiftCore.dylib             0x1b3f18 SetAlgebra<>.init(arrayLiteral:) + 164
10 macadam                        0x1722950 static JSONHandler.serializeJSONObject(_:) + 54 (JSONHandler.swift:54)
11 macadam                        0x17220a4 static JSONHandler.encodeAPIData(_:) + 16 (JSONHandler.swift:16)
12 macadam                        0x175d030 static Network.sendHttpEvent(serverURL:eventName:apiToken:distinctId:properties:updatePeople:completion:) + 144 (Network.swift:144)
13 macadam                        0x1733034 static MixpanelInstance.didDebugInit(serverURL:distinctId:libName:libVersion:) + 554 (MixpanelInstance.swift:554)
14 macadam                        0x172d718 MixpanelInstance.init(apiToken:flushInterval:name:trackAutomaticEvents:optOutTrackingByDefault:useUniqueDistinctId:superProperties:serverURL:) + 227 (MixpanelInstance.swift:227)
15 macadam                        0x172ce98 MixpanelInstance.__allocating_init(apiToken:flushInterval:name:trackAutomaticEvents:optOutTrackingByDefault:useUniqueDistinctId:superProperties:serverURL:) + 215 (MixpanelInstance.swift:215)
16 macadam                        0x17284e4 closure #1 in MixpanelManager.initialize(token:flushInterval:instanceName:trackAutomaticEvents:optOutTrackingByDefault:useUniqueDistinctId:superProperties:serverURL:) + 187 (Mixpanel.swift:187)
17 macadam                        0x172872c partial apply for closure #1 in MixpanelManager.initialize(token:flushInterval:instanceName:trackAutomaticEvents:optOutTrackingByDefault:useUniqueDistinctId:superProperties:serverURL:) + 92 (<compiler-generated>:92)
18 macadam                        0x7bbe08 thunk for @callee_guaranteed () -> () + 20 (<compiler-generated>:20)
19 macadam                        0x7bbe2c thunk for @escaping @callee_guaranteed () -> () + 24 (<compiler-generated>:24)
20 libdispatch.dylib              0x3dd4 _dispatch_client_callout
21 libdispatch.dylib              0x132c4 _dispatch_lane_barrier_sync_invoke_and_complete
22 macadam                        0x172761c MixpanelManager.initialize(token:flushInterval:instanceName:trackAutomaticEvents:optOutTrackingByDefault:useUniqueDistinctId:superProperties:serverURL:) + 181 (Mixpanel.swift:181)
23 macadam                        0x1727348 static Mixpanel.initialize(token:trackAutomaticEvents:flushInterval:instanceName:optOutTrackingByDefault:useUniqueDistinctId:superProperties:serverURL:) + 50 (Mixpanel.swift:50)
24 macadam                        0x1768f18 MixpanelReactNative.initialize(_:trackAutomaticEvents:optOutTrackingByDefault:properties:serverURL:resolver:rejecter:) + 25 (MixpanelReactNative.swift:25)
25 macadam                        0x17690d0 @objc MixpanelReactNative.initialize(_:trackAutomaticEvents:optOutTrackingByDefault:properties:serverURL:resolver:rejecter:) + 320 (<compiler-generated>:320)
26 CoreFoundation                 0x31c84 __invoking___ + 148
27 CoreFoundation                 0x31710 -[NSInvocation invoke] + 428
28 CoreFoundation                 0x31538 -[NSInvocation invokeWithTarget:] + 64
29 macadam                        0x1c54220 -[RCTModuleMethod invokeWithBridge:module:arguments:] + 584 (RCTModuleMethod.mm:584)
30 macadam                        0x1c582bc facebook::react::invokeInner(RCTBridge*, RCTModuleData*, unsigned int, folly::dynamic const&, int, (anonymous namespace)::SchedulingContext) + 196 (RCTNativeModule.mm:196)
31 macadam                        0x1c57a58 facebook::react::RCTNativeModule::invoke(unsigned int, folly::dynamic&&, int)::$_0::operator()() const + 113 (RCTNativeModule.mm:113)
32 macadam                        0x1c579cc invocation function for block in facebook::react::RCTNativeModule::invoke(unsigned int, folly::dynamic&&, int) + 104 (RCTNativeModule.mm:104)
33 libdispatch.dylib              0x213c _dispatch_call_block_and_release
34 libdispatch.dylib              0x3dd4 _dispatch_client_callout
35 libdispatch.dylib              0xb400 _dispatch_lane_serial_drain
36 libdispatch.dylib              0xbf30 _dispatch_lane_invoke
37 libdispatch.dylib              0x16cb4 _dispatch_root_queue_drain_deferred_wlh
38 libdispatch.dylib              0x16528 _dispatch_workloop_worker_thread
39 libsystem_pthread.dylib        0x1f20 _pthread_wqthread + 288
40 libsystem_pthread.dylib        0x1fc0 start_wqthread + 8

The error seems to be located in the class JSONHandler at line 54, the error is not catched :

  var serializedObject: Data?
        do {
            serializedObject = try JSONSerialization
                .data(withJSONObject: serializableJSONObject, options: [])
        } catch {
            Logger.warn(message: "exception encoding api data")
        }

[zihejia]

The code that caused the crash has been removed. Thanks for bringing this up. We will also update React Native.