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🔥 [🐛] missing ga_session_id on part of iOS Analytics events since upgrading to v23.8.3

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#9,115 3 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
38/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Quiet
Tech stack
ios, react-native, typescript
Domain
analytics, mobile

Research direction

Start with the Analytics version details in package.json and the Firebase versions in ios/Podfile, then inspect initialization in AppDelegate.m. Compare events from normal launches with events associated with background launches, especially session_start and ga_session_id. Done means identifying a reproducible cause or confirmed regression and verifying that affected iOS sessions report both values consistently.

Written by the indexing model from the issue text.

Description

blocked: firebase-sdk Keep Open plugin: analytics type: bug

Issue

Hello team,
Since upgrading @react-native-firebase to v23.8.3 (Firebase iOS SDK 12.8.0), on iOS, we are seeing a significant number (~4%) of Analytics events with a missing ga_session_id in production. This was present on the previous version but on a much smaller scale (~0.3%), and the upgrade is the only change correlated with the regression.

After inspecting GA4 events grouped by device, it appears that whenever this issue occurs, all events for the affected session are missing ga_session_id. We also noticed that the session_start event, which would normally precede the rest of the session's events, is also missing. Events from the same device begin reporting a valid ga_session_id again only after the session is recreated (e.g., the app is restarted after 30min).

This behaviour is consistent across all iOS versions we've analyzed (iOS 16 through iOS 26).

We suspect the cause may be related to background launches (e.g. triggered by silent push notifications). However, we were not able to reproduce this issue at all in development.

Thank you very much for the support

Project Files

Javascript
Click To Expand

package.json:

package.json:

  {                                                                                                                                                                                              
    "@react-native-firebase/analytics": "23.8.8",                                                                                                                                              
    "@react-native-firebase/app": "23.8.8",                                                                                                                                                      
    "@react-native-firebase/crashlytics": "23.8.8",                                                                                                                                              
    "@react-native-firebase/installations": "23.8.8",                                                                                                                                            
    "@react-native-firebase/remote-config": "23.8.8",                                                                                                                                            
    "react-native": "0.81.6"                                                                                                                                                                   
  }

iOS
Click To Expand

ios/Podfile:
  • I'm not using Pods
  • I'm using Pods and my Podfile looks like:
  use_frameworks! :linkage => :static                                                                                                                                                            
  $RNFirebaseAsStaticFramework = true                                                                                                                                                          
                                                                                                                                                                                                 
  target 'XXXX' do
    pod 'FirebaseMessaging', '12.10.0'                                                                                                                                                           
  end
AppDelegate.m:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{
    ...
    [FIRApp configure];
  ....
}

Android

Not investigated; issue observed on iOS only.

Environment

Click To Expand

react-native info output:

  System:
    OS: macOS 26.5.2                                                                                                                                                                             
    CPU: (12) arm64 Apple M3 Pro                                                                                                                                                               
  Binaries:                                                                                                                                                                                      
    Node: 20.19.4
    CocoaPods: 1.16.2                                                                                                                                                                            
  npmPackages:                                                                                                                                                                                   
    react: 19.1.4
    react-native: 0.81.6                                                                                                                                                                         
  iOS:                                                                                                                                                                                           
    hermesEnabled: true
    newArchEnabled: true
  • Platform that you're experiencing the issue on:
    • iOS
    • Android
    • iOS but have not tested behavior on Android
    • Android but have not tested behavior on iOS
    • Both
  • react-native-firebase version you're using that has this issue:
    • initially seen in 23.8.3, now on 23.8.8 with same issue
  • Firebase module(s) you're using that has the issue:
    • @react-native-firebase/analytics, @react-native-firebase/crashlytics
  • Are you using TypeScript?
    • Y & 5.8

Dominant language
TypeScript
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Forks
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Avg merge
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Merged PRs (30d)
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