Firestore crash: Can't handle server close in non-started state.

[plu]

Describe your environment

• Xcode version: 9.1
• Firebase SDK version: 4.6.0
• Firebase Component: Firestore
• Component version: 0.9.2

Describe the problem

Crash report from Crashlytics:

Fatal Exception: NSInternalInconsistencyException
FIRESTORE INTERNAL ASSERTION FAILED: Can't handle server close in non-started state.

Fatal Exception: NSInternalInconsistencyException
0  CoreFoundation                 0x181609d04 __exceptionPreprocess
1  libobjc.A.dylib                0x180858528 objc_exception_throw
2  CoreFoundation                 0x181609bd8 +[NSException raise:format:]
3  Foundation                     0x181f99c24 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:]
4  CryptoRadar                    0x1042bfe74 -[FSTStream handleStreamClose:]
5  CryptoRadar                    0x1042c0340 __37-[FSTStream writesFinishedWithError:]_block_invoke
6  libdispatch.dylib              0x180f8d088 _dispatch_call_block_and_release
7  libdispatch.dylib              0x180f8d048 _dispatch_client_callout
8  libdispatch.dylib              0x180f96e48 _dispatch_queue_serial_drain$VARIANT$mp
9  libdispatch.dylib              0x180f977d8 _dispatch_queue_invoke$VARIANT$mp
10 libdispatch.dylib              0x180f98200 _dispatch_root_queue_drain_deferred_wlh$VARIANT$mp
11 libdispatch.dylib              0x180fa04a0 _dispatch_workloop_worker_thread$VARIANT$mp
12 libsystem_pthread.dylib        0x181232fd0 _pthread_wqthread
13 libsystem_pthread.dylib        0x181232c20 start_wqthread

Steps to reproduce:

Unfortunately I don't know how to reproduce it.

[cforkish]

I am experiencing this as well. Unable to reliably reproduce so far, but it mostly (or maybe only) occurs when resuming the app from the background by tapping a push notification.

[brianhiss]

@cforkish I'm able to reliably reproduce this FATAL crash when opening a FCM Push Notification with the app in the background.

Using Firebase (4.6.0)
Using FirebaseAnalytics (4.0.5)
Using FirebaseAuth (4.3.2)
Using FirebaseCore (4.0.11)
Using FirebaseCrash (2.0.2)
Using FirebaseDatabase (4.1.1)
Using FirebaseFirestore (0.9.2)
Using FirebaseInstanceID (2.0.6)
Using FirebaseMessaging (2.0.6)
Using FirebasePerformance (1.0.6)
Using FirebaseStorage (2.0.2)