[REQUIRED] Step 1: Describe your environment

• Xcode version:13.1
• Firebase SDK version:8.10.0
• Installation method: CocoaPods
• Firebase Component: Auth, Core, Database, Firestore, Messaging, Storage
• Target platform(s): iOS

[REQUIRED] Step 2: Describe the problem

Fatal Exception: NSInternalInconsistencyException
0 CoreFoundation 0x9904c __exceptionPreprocess
1 libobjc.A.dylib 0x15f54 objc_exception_throw
2 Foundation 0x130834 -[NSMutableDictionary(NSMutableDictionary) initWithContentsOfFile:]
3 FirebaseFirestore 0x44868 (Missing)
4 FirebaseFirestore 0x44348 (Missing)
5 FirebaseFirestore 0x914b4 (Missing)
6 FirebaseFirestore 0x91554 (Missing)
7 FirebaseFirestore 0xd88a4 (Missing)
8 FirebaseFirestore 0xdf468 (Missing)
9 FirebaseFirestore 0x3b84c (Missing)
10 FirebaseFirestore 0x40650 (Missing)
11 FirebaseFirestore 0x40470 (Missing)
12 FirebaseFirestore 0x38920 (Missing)
13 FirebaseFirestore 0x38528 (Missing)
14 FirebaseFirestore 0x3836c (Missing)
15 FirebaseFirestore 0x121fec (Missing)
16 FirebaseFirestore 0x10bd58 (Missing)
17 FirebaseFirestore 0x10b860 (Missing)
18 FirebaseFirestore 0x68b18 (Missing)
19 FirebaseFirestore 0x5b40 (Missing)
20 FirebaseFirestore 0x1169c0 (Missing)
21 libdispatch.dylib 0x4660 _dispatch_client_callout
22 libdispatch.dylib 0xbde4 _dispatch_lane_serial_drain
23 libdispatch.dylib 0xc958 _dispatch_lane_invoke
24 libdispatch.dylib 0x171a8 _dispatch_workloop_worker_thread
25 libsystem_pthread.dylib 0x10f4 _pthread_wqthread
26 libsystem_pthread.dylib 0xe94 start_wqthread

Fatal Exception: NSInternalInconsistencyException
0 CoreFoundation 0x129754 __exceptionPreprocess
1 libobjc.A.dylib 0x287a8 objc_exception_throw
2 CoreFoundation 0x2b3f8 -[CFPrefsSearchListSource addManagedSourceForIdentifier:user:]
3 Foundation 0xd0a6c -[NSAssertionHandler handleFailureInFunction:file:lineNumber:description:]
4 FirebaseFirestore 0x44868 (Missing)
5 FirebaseFirestore 0x44348 (Missing)
6 FirebaseFirestore 0x914b4 (Missing)
7 FirebaseFirestore 0x91554 (Missing)
8 FirebaseFirestore 0xd88a4 (Missing)
9 FirebaseFirestore 0xdf468 (Missing)
10 FirebaseFirestore 0x3b84c (Missing)
11 FirebaseFirestore 0x40650 (Missing)
12 FirebaseFirestore 0x40470 (Missing)
13 FirebaseFirestore 0x38920 (Missing)
14 FirebaseFirestore 0x38528 (Missing)
15 FirebaseFirestore 0x3836c (Missing)
16 FirebaseFirestore 0x121fec (Missing)
17 FirebaseFirestore 0x10bd58 (Missing)
18 FirebaseFirestore 0x10b860 (Missing)
19 FirebaseFirestore 0x68b18 (Missing)
20 FirebaseFirestore 0x5b40 (Missing)
21 FirebaseFirestore 0x1169c0 (Missing)
22 libdispatch.dylib 0x481c _dispatch_client_callout
23 libdispatch.dylib 0xc004 _dispatch_lane_serial_drain
24 libdispatch.dylib 0xcc00 _dispatch_lane_invoke
25 libdispatch.dylib 0x174bc _dispatch_workloop_worker_thread
26 libsystem_pthread.dylib 0x37a4 _pthread_wqthread
27 libsystem_pthread.dylib 0xa74c start_wqthread

Fatal Exception: NSInternalInconsistencyException
0 CoreFoundation 0x12a5f0 __exceptionPreprocess
1 libobjc.A.dylib 0x5bcc objc_exception_throw
2 CoreFoundation 0x2d7bc +[_CFXNotificationTokenRegistration keyCallbacks]
3 Foundation 0xd5134 -[NSAssertionHandler handleFailureInFunction:file:lineNumber:description:]
4 FirebaseFirestore 0x44868 (Missing)
5 FirebaseFirestore 0x44348 (Missing)
6 FirebaseFirestore 0x914b4 (Missing)
7 FirebaseFirestore 0x91554 (Missing)
8 FirebaseFirestore 0xd88a4 (Missing)
9 FirebaseFirestore 0xdf468 (Missing)
10 FirebaseFirestore 0x3b84c (Missing)
11 FirebaseFirestore 0x40650 (Missing)
12 FirebaseFirestore 0x40470 (Missing)
13 FirebaseFirestore 0x38920 (Missing)
14 FirebaseFirestore 0x38528 (Missing)
15 FirebaseFirestore 0x3836c (Missing)
16 FirebaseFirestore 0x121fec (Missing)
17 FirebaseFirestore 0x10bd58 (Missing)
18 FirebaseFirestore 0x10b860 (Missing)
19 FirebaseFirestore 0x68b18 (Missing)
20 FirebaseFirestore 0x5b40 (Missing)
21 FirebaseFirestore 0x1169c0 (Missing)
22 libdispatch.dylib 0x5b524 _dispatch_client_callout
23 libdispatch.dylib 0x38b3c _dispatch_lane_serial_drain$VARIANT$armv81
24 libdispatch.dylib 0x3954c _dispatch_lane_invoke$VARIANT$armv81
25 libdispatch.dylib 0x4284c _dispatch_workloop_worker_thread
26 libsystem_pthread.dylib 0xbb74 _pthread_wqthread
27 libsystem_pthread.dylib 0xe740 start_wqthread

Steps to reproduce:

Three different crash log added above but all occurred on same condition. Basically crash happened when user update firestore document field value to "nil" while force close the app.

Relevant Code:

let fieldValue:Int? = nil
let updatedMap = ["number_field": fieldValue]
Firestore.firestore().collection("users")
.document(String(120))
.setData(updatedMap as [String : Any], merge: true)