Firebase-ios-sdk: iOS 12 logEvent crash

[alfonsomestre]

[REQUIRED] Step 2: Describe your environment

• Xcode version: 10.2
• Firebase SDK version: 6.2.0
• Firebase Component:
  FirebaseAnalytics 6.0.1
  FirebaseCore 6.0.2
  FirebaseInAppMessaging 0.15.0
  FirebaseInstanceID 4.1.1
  FirebaseMessaging 4.0.2
  FirebaseRemoteConfig 4.0.0
• Component version: (FirebaseAnalytics) 6.0.1

[REQUIRED] Step 3: Describe the problem

App crashes sometimes with users of iOS 12

The crash is the following:

Steps to reproduce:

What happened? How can we make the problem occur?
This does not always happen, and it does not have a patter. I leave the crash report:

Fatal Exception: NSGenericException
0  CoreFoundation                 0x1f6ec23a8 __exceptionPreprocess
1  libobjc.A.dylib                0x1f60c7d00 objc_exception_throw
2  CoreFoundation                 0x1f6ec1c10 -[__NSSingleObjectEnumerator initWithObject:]
3  libobjc.A.dylib                0x1f60da4a0 objc_enumerationMutation
4  _                              0x102cd7fa4 +[APMEvent normalizedParametersForParameters:isPublicEvent:]
5  _                              0x102cd8aac -[APMEvent initWithOrigin:isPublic:name:timestamp:previousTimestamp:parameters:]
6  _                              0x102bfd324 __62-[FIRAnalyticsConnector registerAnalyticsListener:withOrigin:]_block_invoke
7  _                              0x102c98c78 +[APMAnalytics notifyEventListenersOnSerialQueue:]
8  _                              0x102c95b00 +[APMAnalytics logEventsOnWorkerQueue:notifyEventListeners:]
9  _                              0x102c96780 +[APMAnalytics logEventOnSerialQueueWithOrigin:isPublicEvent:name:parameters:timestamp:ignoreEnabled:ignoreInterceptor:addedScreenParameters:]
10 _                              0x102c96068 __65+[APMAnalytics logEventWithOrigin:isPublicEvent:name:parameters:]_block_invoke_3
11 libdispatch.dylib              0x1f68d0304 _dispatch_call_block_and_release
12 libdispatch.dylib              0x1f68d1884 _dispatch_client_callout
13 libdispatch.dylib              0x1f68d8dd4 _dispatch_lane_serial_drain
14 libdispatch.dylib              0x1f68d9918 _dispatch_lane_invoke
15 libdispatch.dylib              0x1f68e1cc0 _dispatch_workloop_worker_thread
16 libsystem_pthread.dylib        0x1f6acca98 _pthread_wqthread
17 libsystem_pthread.dylib        0x1f6ad2dc4 start_wqthread

Relevant Code:

There is no relevant code, i just call : Analytics.logEvent(eventName, parameters: parameters)

Thanks!

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[paulb777]

Thanks for the report. Opened internal issue at b/136009423

[paulb777]

Thanks again for the report @alfonsomestre. The fix is staged for the next Firebase release milestone - M51 (6.4.0)

[alfonsomestre]

Thank you @paulb777! Really appreciate, we will look forward to the next release!

[at-binhdo]

@alfonsomestre Is this issue fixed after 6.4.0 release. It seem still happens on our app, which import 6.5.0

[alfonsomestre]

Yes @at-binhdo, you are right. It still happens in version 6.5.0

[paulb777]

We have a fix coming in next week's 6.7.0

[alfonsomestre]

Thanks, @paulb777 !!

[bogdannedelcu]

Hello @paulb777, I am using Firebase with Flutter and I struggle with this error. I have latest version of Firebase and even disabled Analytics but still crashes randomly. The log and all configs are detailed here: https://github.com/flutter/flutter/issues/42599

Thank you!

[paulb777]

@bogdannedelcu We are unlikely to be able to help without a reproducible example or a backtrace of the crash - neither of which I see at the flutter issue. If you can get one of those, please open another issue in this repo and we'll investigate.